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my footer doesn't stay at the bottom of the site when I zoom out the site

Pls help me, I am making a site and my footer isn't staying at the bottom, when I zoom out the site. I'm a beginner so the code can be a little messy.
as you can see, the footer doesn't stay at the bottom, I have searched here for people with a similar problem with the code and I found some. And I tried some of the solutions, but none of them worked for me.
I think it doesn't work because there's something else wrong with my css, but I just cant figure it out.
html{
box-sizing:border-box;
-ms-text-size-adjust:100%;
-webkit-text-size-adjust:100%;
}
*,*:before,*:after{
box-sizing:inherit
}
body{
margin: 0;
overflow-x: hidden;
background-color: #f6f6f6;
}
ul {
padding: 4px 8px;
float: right;
}
a.nav-button {
padding: 8px 16px;
text-decoration: none;
color: black;
letter-spacing: 4px;
border: none;
outline: none;
font-family: Verdana,sans-serif;
font-size: 15px;
line-height: 1.5;
}
a.nav-button:hover {
background-color: #cccccc;
}
img.logo{
padding-top: 14px;
height: 50px;
float:left;
}
div.menu{
position:fixed;
width:100%;
z-index:1;
background-color: #ffffff;
}
div.front_img{
padding-top:500;
vertical-align: middle;
display:inline-block;
max-width:100%;
width: 100%;
max-height: 60%;
position: relative;
background-image: url(../images/front_image.jpg);
background-size: cover;
left:50%;
top:0;
transform:translate(-50%,0%);
-ms-transform:translate(-50%,0%);
}
div.webpage {
max-width:980px;
margin:auto;
}
div.container {
padding:0.01em 16px;
padding-top:32px;
padding-bottom: 32px;
max-width: 100%;
position: relative;
left:50%;
top:0;
transform:translate(-50%,0%);
-ms-transform:translate(-50%,0%);
background-color: #f6f6f6;
}
div.article {
padding:0.01em 16px;
padding-top:32px;
padding-bottom: 32px;
max-width: 100%;
position: relative;
left:50%;
top:0;
transform:translate(-50%,0%);
-ms-transform:translate(-50%,0%);
background-color: #f6f6f6;
}
div.h3-container {
border-bottom:1px solid #ccc;
width:100%;
}
h3 {
font-size: 24px;
font-family: "Segoe UI",Arial,sans-serif;
font-weight: 400;
margin: 10px 0;
}
p {
font-family: Verdana,sans-serif;
font-size: 15px;
line-height: 1.5;
display: block;
-webkit-margin-before: 1em;
-webkit-margin-after: 1em;
-webkit-margin-start: 0px;
-webkit-margin-end: 0px;
}
div.footer {
position: relative;
padding-top: 6;
padding-bottom: 6;
padding-right: 8;
width: 100%;
text-align: right;
background-color: black;
color: goldenrod;
}
div.footer, a{
color: goldenrod;
}
div.footer-container {
position: relative;
padding:0.01em 16px;
padding-top:32px;
padding-bottom: 32px;
max-width: 100%;
width: 100%;
background-color: black;
color:goldenrod;
left:50%;
top:0;
transform:translate(-50%,0%);
-ms-transform:translate(-50%,0%);
border-bottom:1px solid goldenrod;
}
div.footer-background{
background-color: black;
overflow: hidden;
}
div.leverancier-wrap {
padding-left: 22;
background-color: white;
}
div.footer-content {
// tried position:fixed; here but didnt work :c
}
HTML
<div class="footer-content">
<div class="container" style="max-width:1564px">
<div class="h3-container" id="intoduction">
<h3 class="Welcome-title"><img src="images/location_icon.png" height="30" length="20" hspace="20"/>Installatietechniek Haaglanden bevindt zich hier.</h3>
</div>
</div>
<style>
#map {
width: 100%;
height: 400px;
background-color: grey;
border-bottom: 5pt solid black;
}
</style>
<div id="map"></div>
<script>
function initMap() {
var uluru = {lat: 52.0442081, lng: 4.3370828};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 17,
center: uluru
});
var marker = new google.maps.Marker({
position: uluru,
map: map
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=[aint getting mah map]&callback=initMap">
</script>
<div class="leverancier-wrap">
<img class="leveranciers" src="http://www.installatietechniekhaaglanden.nl/images/slide1.jpg" height="30" width="300">
<img class="leveranciers" src="http://www.installatietechniekhaaglanden.nl/images/slide2.jpg" height="30" width="300">
<img class="leveranciers" src="http://www.installatietechniekhaaglanden.nl/images/slide3.jpg" height="30" width="300">
<img class="leveranciers" src="http://www.installatietechniekhaaglanden.nl/images/slide4.jpg" height="30" width="300">
</div>
<div class="footer-background">
<div class="footer-container" style="max-width:1564px">
<div class="footer-text">
<h3>Contactgegevens</h3>
<p>Installatietechniek Haaglanden<span style="display:inline-block; width: 280px;"><img src="images/telphone-icon.png" height="16" length="8" hspace="259"/></span>070 7620180</p>
<p>Burgemeester Elsenlaan 321<span style="display:inline-block; width: 297px;"><img src="images/mail-icon.png" height="16" length="8" hspace="276"/></span>info#installatietechniekhaaglanden.nl</p>
<p>2282 MZ Rijswijk<img src="images/facebook-icon.png" height="16" length="8" hspace="362"/></p>
</div>
</div>
</div>
<div class="footer">
<p>Copyright © installatietechniekhaaglanden.nl. Designed by ajeeth</p>
</div>
</div>

Negative margin method
Use a negative bottom margin like this. Keep the .push div empty.
HTML
<body>
<div class="wrapper">
...content...
<div class="push"></div>
</div>
<footer class="footer">All rights reserved</footer>
</body>
CSS
html, body {
height: 100%;
margin: 0;
}
.wrapper {
min-height: 100%;
/* Equal to height of footer */
/* But also accounting for potential margin-bottom of last child */
margin-bottom: -50px;
}
.footer,
.push {
height: 50px;
}
Full demo: codepen.io
Other methods
You can also use negative top margins, calc(), flexbox, and grid to achieve the same effect in a better way.
Original source: This and 4 other ways originates from css-tricks.com

Give position: fixed; and to fix it at the bottom even if the content is little like the below demo
body {
margin: 0;
}
div.footer-content {
background: red;
position: fixed;
bottom: 0;
width: 100%;
}
HTML
<div class="footer-content">
this is the footer
</div>

You mean a Sticky Footer?
Change the CSS in
.footer-content { position: absolute; bottom: 0; width: 100%; }

Increasing CSS value instead of decreasing with jquery

I have a page that I need to convert to rtl.
The active tab & tab arrow position doesn't match.
I need to change the tab arrow position from TAB 1 to TAB 2 and vice versa.
I already changed some js value but in vain
HTML :
<div class="container">
<div class="row">
<div class="col-md-12">
<div class="main-search-container">
<form class="main-search-form">
<div class="search-type">
<label class="active"><input class="first-tab" name="tab" checked="checked" type="radio">TEXT</label>
<label><input name="tab" type="radio">TEXT</label>
<label><input name="tab" type="radio">TEXT</label>
<div class="search-type-arrow"></div>
</div>
<div class="main-search-box">
<div class="main-search-input larger-input">
</div>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
CSS :
body {
direction:rtl;
color: #707070;
background-color: #cccccc;
}
.parallax {
background-repeat: no-repeat;
background-position: 50% 50%;
position: relative;
z-index: 99;
}
.parallax-overlay {
position: absolute;
top: 0;
right: 0;
width: 100%;
height: 100%;
z-index: 101;
background-color: #333;
opacity: 0.4;
}
.parallax-content {
position: relative;
z-index: 999;
padding: 105px 0;
}
.main-search-container {
transform: translate3d(0,-12px,0);
}
.main-search-form {
width: 660px;
display: block;
margin: 0 auto;
position: relative;
margin-top: 35px;
}
.search-type {
display: inline-block;
padding-bottom: 35px;
position: relative;
}
.search-type input[type="radio"] { display: none; }
.search-type label {
background-color: #fff;
color: #333;
cursor: pointer;
display:inline-block;
text-align: center;
padding: 9px 18px;
margin: 0 0 0 15px;
float: right;
transition: all 0.2s;
border-radius: 3px;
}
.search-type label:hover,
.search-type label.active {
background-color: #66676b;
color: #fff;
}
.search-type-arrow {
width: 0;
height: 0;
border-right: 15px solid transparent;
border-left: 15px solid transparent;
border-bottom: 15px solid #fff;
position: absolute;
bottom: 0;
right: 0;
transform: translate3d(-3px,0,0);
}
.main-search-box {
background-color: #fff;
box-shadow: 0px 0px 10px 0px rgba(0,0,0,0.12);
padding: 30px;
padding-bottom: 20px;
margin-top: -9px;
border-radius: 3px;
}
.main-search-box.no-shadow {
box-shadow: none;
padding: 0;
margin: 0;
}
.search-container .main-search-input input {
font-weight: 500;
font-size: 17px;
height: 57px !important;
float: right;
box-sizing: border-box;
border: none;
float: right;
height: auto;
}
.search-container .main-search-input button.button {
width: initial;
min-width: 100px;
max-width: 100px;
margin: 0;
font-size: 18px;
position: relative;
margin-right: 20px;
flex: 0 auto;
height: 57px;
}
.search-container .main-search-input button.button i {
position: relative;
right: 2px;
}
JS :
(function($){
"use strict";
$(document).ready(function(){
function searchTypeButtons() {
// Radio attr reset
$('.search-type label.active input[type="radio"]').prop('checked',true);
// Positioning indicator arrow
var buttonWidth = $('.search-type label.active').width();
var arrowDist = $('.search-type label.active').position().left;
$('.search-type-arrow').css('right', arrowDist + (buttonWidth/2) );
$('.search-type label').on('change', function() {
$('.search-type input[type="radio"]').parent('label').removeClass('active');
$('.search-type input[type="radio"]:checked').parent('label').addClass('active');
// Positioning indicator arrow
var buttonWidth = $('.search-type label.active').width();
var arrowDist = $('.search-type label.active').position().left;
$('.search-type-arrow').css({
'right': arrowDist + (buttonWidth/2),
'transition':'right 0.4s cubic-bezier(.87,-.41,.19,1.44)'
});
});
}
// Init
if ($(".main-search-form").length){
searchTypeButtons();
$(window).on('load resize', function() { searchTypeButtons(); });
}
// ------------------ End Document ------------------ //
});
})(this.jQuery);
I'm using bootstrap, bootstrap rtl flipped & jquery 2.2.0 as external ressources.
Here's the snippet:
https://jsfiddle.net/s3hy37nd/5/
Can someone help with that?

So many errors... I can only say I tried to comment them all inside the code so... yeah it's all there:
"use strict";
jQuery(function($) { // DOM ready and $ alias secured
// Radio attr reset (on DOM ready... makes sense?)
$('.search-type label.active input[type="radio"]').prop('checked', true);
function repositionArrow() { // Use a meaningful fn name
// Positioning indicator arrow
// Width? No. You need .outerWidth! you have paddings!!
var buttonWidth = $('.search-type label.active').outerWidth();
// Again use meaningful names
// If you do console.log( $('.search-type label.active').position() );
// you'll see no `.right` property. So yeah, use .left
var posLeft = $('.search-type label.active').position().left;
$('.search-type-arrow').css({
left: posLeft + (buttonWidth / 2)
// No need for transition here - move it to Stylesheet instead
});
}
// Init
if ($(".main-search-form").length) {
// You might want this too inside the "if"
$('.search-type label').on('change', function() {
$('.search-type input[type="radio"]').parent('label').removeClass('active');
$('.search-type input[type="radio"]:checked').parent('label').addClass('active');
repositionArrow(); // Now you have such function
});
repositionArrow();
$(window).on('load resize', repositionArrow);
}
});
body {
direction: rtl;
color: #707070;
background-color: #cccccc;
}
.parallax {
background-repeat: no-repeat;
background-position: 50% 50%;
position: relative;
z-index: 99;
}
.parallax-overlay {
position: absolute;
top: 0;
right: 0;
width: 100%;
height: 100%;
z-index: 101;
background-color: #333;
opacity: 0.4;
}
.parallax-content {
position: relative;
z-index: 999;
padding: 105px 0;
}
.main-search-container {
transform: translate3d(0, -12px, 0);
}
.main-search-form {
width: 660px;
display: block;
margin: 0 auto;
position: relative;
margin-top: 35px;
}
.search-type {
display: inline-block;
padding-bottom: 35px;
position: relative;
}
.search-type input[type="radio"] {
display: none;
}
.search-type label {
position: relative;
/* YOU NEED SOME POSITION! */
background-color: #fff;
color: #333;
cursor: pointer;
display: inline-block;
text-align: center;
padding: 9px 18px;
margin: 0 0 0 15px;
/*float: right; WHY? you use rtl already */
transition: all 0.2s;
border-radius: 3px;
}
.search-type label:hover,
.search-type label.active {
background-color: #66676b;
color: #fff;
}
.search-type-arrow {
width: 0;
height: 0;
border-right: 15px solid transparent;
border-left: 15px solid transparent;
border-bottom: 15px solid #fff;
position: absolute;
bottom: 0;
/*right: 0; ...Nope. See JS, we need left */
left: calc(100% - 30px);
/* calc to the rescue */
/*transform: translate3d(-3px,0,0); but why */
transition: left 0.4s cubic-bezier(.87, -.41, .19, 1.44);
/* Moved from JS */
}
.main-search-box {
background-color: #fff;
box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.12);
padding: 30px;
padding-bottom: 20px;
margin-top: -9px;
border-radius: 3px;
}
<div class="parallax-content">
<div class="container">
<div class="row">
<div class="col-md-12">
<div class="main-search-container">
<form class="main-search-form">
<div class="search-type">
<label class="active"><input class="first-tab" name="tab" checked="checked" type="radio">TAB 1</label>
<label><input name="tab" type="radio">TAB 2</label>
<label><input name="tab" type="radio">TAB 3</label>
<div class="search-type-arrow"></div>
</div>
<div class="main-search-box">
<div class="main-search-input larger-input">
</div>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
Updated jsFiddle

Horizontal Div Scroll

I'm quite new to Jquery, I'm trying to implement horizontal scrolling on a div using the scrollLeft property, I'm not getting any error messages and nothing seems to be working, could someone explain why? Thanks in advance
this is my code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js">
$(document).ready (function(){
var pos = $("#container").scrollLeft();
$(".prev").click(function(){
$("#container").animate({
scrollLeft: pos - 200;
});
});
});
</script>
<style>
#container{
max-width: 938px;
height: 500px;
border: 2px solid black;
margin-left: auto;
margin-right: auto;
overflow: scroll;
/*display: table;*/
}
.picsdiv{
display: table-cell;
min-width: 286px;
padding-right: 80px;
height: 508px;
border: 2px solid pink;
}
.prev, .next {
cursor: pointer;
position: absolute;
top: 250px;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
border: 2px solid pink;
}
.next {
right: 170px;
border-radius: 3px 0 0 3px;
}
.prev{
left: 170px;
}
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
</style>
<body>
<div id="container">
<div class="picsdiv">
</div>
<div class="picsdiv">
</div>
<div class="picsdiv">
</div>
<div class="picsdiv">
</div>
<a class="prev">❮</a>
<a class="next">❯</a>
</div>
</body>

take out the semi-colon on this line and it should work
scrollLeft: pos - 200;

firstly you must close script tag that include jquery file and also open another script tag for your jquery code

I just added a seperate script tag for the Jquery code and used the first one to only refer to the library and it now works. Thanks for all your help

You have done 2 mistakes in your code:
scrollLeft: pos - 200; should be like scrollLeft: (pos - 200), because you are passing an object as parameter
Write two <script> tags, one for jQuery, like below
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js" type="text/javacsript"></script>
And another for your custom java-script
<script type="text/javascript">
$(document).ready (function(){
var pos = $("#container").scrollLeft();
$(".prev").click(function(){
$("#container").animate({
scrollLeft: (pos - 200)
});
});
});
Because you can not write code inside element if you are using ths element as external reference.
Here is your complete running code
<html>
<head>
<style>
#container{
max-width: 938px;
height: 500px;
border: 2px solid black;
margin-left: auto;
margin-right: auto;
overflow: scroll;
/*display: table;*/
}
.picsdiv{
display: table-cell;
min-width: 286px;
padding-right: 80px;
height: 508px;
border: 2px solid pink;
}
.prev, .next {
cursor: pointer;
position: absolute;
top: 250px;
width: auto;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
border: 2px solid pink;
}
.next {
right: 170px;
border-radius: 3px 0 0 3px;
}
.prev{
left: 170px;
}
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
</style>
</head>
<body>
<div id="container">
<div class="picsdiv">
</div>
<div class="picsdiv">
</div>
<div class="picsdiv">
</div>
<div class="picsdiv">
</div>
<a class="prev"><</a>
<a class="next">></a>
</div>
</body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready (function(){
var pos = $("#container").scrollLeft();
$(".prev").click(function(){
$("#container").animate({
scrollLeft: (pos - 200)
});
});
});
</script>
</html>

jQuery click event is not working

I have a menu on the left where all the elements have the same class. I've added the event $('.menuitem').click and also tried several other options, even calling the event based on the div id but without success.
As there aren't any error messages on the browser console, I'm kinda lost on the search for the error. I appreciate if you could help me figure out what the problem is.
Here is the Fiddle
HTML:
<div class='mainwindow'>
<div class='menupane'>
<div id='entity' class='menuitem'><p class='glyphicon glyphicon-triangle-right'>ENTITIES</p></div>
<div class='menuitem'><p class='glyphicon glyphicon-triangle-right'>COURSES</p></div>
<div class='menuitem'><p class='glyphicon glyphicon-triangle-right'>STUDENTS</p></div>
<div class='menuitem'><p class='glyphicon glyphicon-triangle-right'>CLASSES</p></div>
<div class='menuitem'></div>
</div>
<div class='contentpane'></div>
</div>
DOM:
$(document).ready(function(){
console.log("loaded");
$('.menuitem').click(function(){
console.log("CLICKED 1");
});
$('#entity').click(function(){
console.log("CLICKED 2");
});
$('.menupane').on('click', '.menuitem', function(){
console.log('CLICKED 3');
});
});
As you can see, I tried adding the click event through several methods and I'm not getting it. Thanks a ton for your help.

Negative z-index will not let event to dispatch on elements.
$(document).ready(function() {
console.log("loaded");
$('.menuitem').click(function() {
console.log("CLICKED 1");
});
$('#entity').click(function() {
console.log("CLICKED 2");
});
$('.menupane').on('click', '.menuitem', function() {
console.log('CLICKED 3');
});
});
.header {
position: absolute;
background-color: #525252;
height: 5%;
width: 100%;
min-height: 30px;
display: block;
margin: 0;
z-index: 0;
font-weight: 700;
line-height: 175%;
font-size: 1.4em;
text-align: center;
color: #FFFFFF;
display: inline-block
}
.mainwindow .menupane {
position: relative;
display: inline-block;
width: 25%;
min-width: 200px;
background-color: #FFFFFF;
margin: 0;
box-shadow: 1px 0px 10px -0px #F5F5F5;
//z-index: -1;
padding-top: 40px;
}
.mainwindow .contentpane {
position: relative;
display: inline-block;
width: 100%;
background-color: #FFFFFF;
margin: 0;
//z-index: -2;
padding-top: 40px;
}
.menuitem {
background-color: #525252;
position: relative;
width: 75%;
height: 1.5em;
min-height: 10px;
border-radius: 0.65em;
margin: 7.5%;
color: lightgray;
/*font-size: 0.8vw;*/
/*line-height: 1.5em;*/
padding-left: 10%;
border: 0.05em solid lightgray;
/*box-shadow: 0px 0px 1px 1px gray;*/
}
glyphicon-triangle-right {
transition: transform 180ms ease-in;
}
glyphicon-triangle-right.rotate90 {
transform: rotate(90deg);
transition: transform 180ms ease-in;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div class='header'>SISTEMA CONTROLE DE CURSOS</div>
<div class='mainwindow'>
<div class='menupane'>
<div id='entity' class='menuitem'>
<p class='glyphicon glyphicon-triangle-right'>ENTITIES</p>
</div>
<div class='menuitem'>
<p class='glyphicon glyphicon-triangle-right'>COURSES</p>
</div>
<div class='menuitem'>
<p class='glyphicon glyphicon-triangle-right'>STUDENTS</p>
</div>
<div class='menuitem'>
<p class='glyphicon glyphicon-triangle-right'>CLASSES</p>
</div>
<div class='menuitem'></div>
</div>
<div class='contentpane'></div>
</div>
Fiddle Demo

Your z-index CSS was causing issues. Here is an updated example without those so you can fix from there: https://jsfiddle.net/zxgkprw9/1/

your issue is not the binding of the event but the class .mainwindow .menupane having this property position: relative;
the events is added properly but due to this class the actual position of the element is different . Remove this property and all work fine
jsfiddle : https://jsfiddle.net/zxgkprw9/3/
.mainwindow .menupane{
display: inline-block;
width: 25%;
min-width: 200px;
background-color: #FFFFFF;
margin: 0;
box-shadow: 1px 0px 10px -0px #F5F5F5;
z-index: -1;
padding-top: 40px;
}

Javascript - bring up infobox on click image

I have some images, I need to have a clickevent on them bringing up an infobox on each image.
$('.show-infobox').on('click', function() {
// Hide all infoboxes to prevent multiple showing at once
$('.infobox').addClass('hidden');
// Show infobox background
$('.infobox-container').removeClass('hidden');
// Show infobox matching last part of ID
$('#' + this.id.replace('show')).removeClass('hidden');
});
$('.hide-infobox').on('click', function() {
// Manually hide all infoboxes and background
$('.infobox-container').addClass('hidden');
$('.infobox').addClass('hidden');
}).children().on('click', function() {
return false;
});
#charset "utf-8";
.container {
height: 800px;
width: 1000px;
margin: 0;
}
body {
padding:0px;
width:100%;
}
header
{
top: 11px;
width: 100%;
padding-bottom: 10px;
}
#wrapper{
margin-left: auto;
margin-right: auto;
width: 1000px;
}
ol {
list-style-type: upper-roman;
}
H3 {
font-size:16px;
text-shadow: 0px 0px 5px grey;
}
.mainBox
{
background-color: #F0F0F0;
width: 700px;
box-shadow: 0px 0px 15px grey;
top: 310px;
border-radius: 20px;
padding-top: 30px;
padding-right: 50px;
padding-left: 50px;
}
.container nav ul {
list-style-type: none;
}
nav
{
width: 720px;
height:40px;
background-color: #F0F0F0;
border-color: grey;
border-width: 1px;
border-style: solid;
border-radius: 10px;
font-family: 'PT Sans';
font-size: 20px;
margin-bottom:50px;
}
ul{
padding-right: 20px;
margin-top: 6px;
}
a {
color: black;
text-decoration: none;
padding: 25px;
}
a:hover
{
color:#00A0C6;
text-decoration:none;
cursor:pointer;
}
.imagePack
{
float:left;
height: 300px;
width: 200px;
border-style:solid;
}
img.staff {
cursor: pointer;
opacity: 0.4;
filter: alpha(opacity=40); /* For IE8 and earlier */
}
img.staff:hover {
opacity: 1.0;
filter: alpha(opacity=100); /* For IE8 and earlier */
}
.infobox-container {
background: rgba(0, 0, 0, .2);
width: 100%;
height: 100%;
position: absolute;
display: flex;
justify-content: center;
align-items: center;
}
.infobox {
background: #fff;
display: inline-block;
padding: 2rem;
border: solid 1px #eee;
}
.show-infobox {
cursor: pointer;
}
.hidden {
display: none;
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>Test</title>
<link href="style.css" rel="stylesheet" type="text/css" />
<script src="jquery-2.1.4.js"></script>
<script>
$( document ).ready(function() {
$('.show-infobox').on('click', function() {
// Hide all infoboxes to prevent multiple showing at once
$('.infobox').addClass('hidden');
// Show infobox background
$('.infobox-container').removeClass('hidden');
// Show infobox matching last part of ID
$('#' + this.id.replace('show')).removeClass('hidden');
});
$('.hide-infobox').on('click', function() {
// Manually hide all infoboxes and background
$('.infobox-container').addClass('hidden');
$('.infobox').addClass('hidden');
}).children().on('click', function() {
return false;
});
});
</script>
<div id="wrapper">
<center><header><img src="Bilder/spegel.jpg"/></header></center>
</head>
<!--Bakgrundsbild-->
<center><body bgcolor="#FFFFFF ">
<!--Javascript-->
<!--Lådan som håller inne allt innehåll-->
<div class="container">
<!--Header-->
<!--Nedan skrivs innehål/text till sidan-->
<div class="mainBox">
<center><img src="Bilder/title.png"></center>
<p>
<div class="infobox-container hide-infobox hidden">
<div id="infobox-1" class="infobox hidden">This is infobox 1! <span class="hide-infobox">[close]</span></div>
<div id="infobox-2" class="infobox hidden">This is infobox 2! <span class="hide-infobox">[close]</span></div>
</div>
<span id="show-infobox-1" class="show-infobox">Show infobox 1</span>
<span id="show-infobox-2" class="show-infobox">Show infobox 2</span>
</div>
</body></center>
</div>
</html>
At the moment Im just trying to bring up the infobox on a simple text just to see if it works. But it doesn't. Only the container comes up without the actual infobox.

I am just showing how this can be done. Still you need to change your code a lot.
I suggest you to go through w3schools for better understanding.
This is DEMO
$(".infobox-container, .infobox").hide();
$(".show-infobox").click(function()
{
var curId = this.id;
if(curId == "show1")
{
$(".infobox-container, #infobox-1").fadeIn(100);
}
if(curId == "show2")
{
$(".infobox-container, #infobox-2").fadeIn(100);
}
});
$(".hide-infobox").click(function()
{
$(".infobox-container, .infobox").fadeOut();
});
#charset"utf-8";
.container {
height: 800px;
width: 1000px;
margin: 0;
}
body {
padding:0px;
width:100%;
}
header {
top: 11px;
width: 100%;
padding-bottom: 10px;
}
#wrapper {
margin-left: auto;
margin-right: auto;
width: 1000px;
}
ol {
list-style-type: upper-roman;
}
H3 {
font-size:16px;
text-shadow: 0px 0px 5px grey;
}
.mainBox {
background-color: #F0F0F0;
width: 700px;
box-shadow: 0px 0px 15px grey;
top: 310px;
border-radius: 20px;
padding-top: 30px;
padding-right: 50px;
padding-left: 50px;
}
.container nav ul {
list-style-type: none;
}
nav {
width: 720px;
height:40px;
background-color: #F0F0F0;
border-color: grey;
border-width: 1px;
border-style: solid;
border-radius: 10px;
font-family:'PT Sans';
font-size: 20px;
margin-bottom:50px;
}
ul {
padding-right: 20px;
margin-top: 6px;
}
a {
color: black;
text-decoration: none;
padding: 25px;
}
a:hover {
color:#00A0C6;
text-decoration:none;
cursor:pointer;
}
.imagePack {
float:left;
height: 300px;
width: 200px;
border-style:solid;
}
img.staff {
cursor: pointer;
opacity: 0.4;
filter: alpha(opacity=40);
/* For IE8 and earlier */
}
img.staff:hover {
opacity: 1.0;
filter: alpha(opacity=100);
/* For IE8 and earlier */
}
.infobox-container {
background: rgba(0, 0, 0, .2);
width: 100%;
height: 100%;
position: absolute;
display: flex;
justify-content: center;
align-items: center;
}
.infobox {
background: #fff;
display: inline-block;
padding: 2em;
border: solid 1px #eee;
}
.show-infobox {
cursor: pointer;
}
.hidden {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div id="wrapper">
<center>
<header>
<img src="Bilder/spegel.jpg" />
</header>
</center>
<center>
<!--Lådan som håller inne allt innehåll-->
<div class="container">
<!--Header-->
<!--Nedan skrivs innehål/text till sidan-->
<div class="mainBox">
<center>
<img src="Bilder/title.png" />
</center>
<p>
<div class="infobox-container">
<div id="infobox-1" class="infobox">This is infobox 1! <span class="hide-infobox">[close]</span></div>
<div id="infobox-2" class="infobox">This is infobox 2! <span class="hide-infobox">[close]</span></div>
</div>
</p>
<span class="show-infobox" id="show1">Show infobox 1</span>
<span class="show-infobox" id="show2">Show infobox 2</span>
</div>
</div>
</center>
</div>