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How to display background for a specific bloc

I have joined a GIF below, if you notice the last two wallpapers, they are showing almost at the same time. I'm actually looking for a bit of a time lag between the two when displaying.
Actually, it's a timeline that i copied from : https://codepen.io/knyttneve/pen/bgvmma?editors=1000, but i changed the HTML to adapt it to the project.
This is the js code:
var fn_timeline = function() {
$.fn.timeline = function() {
var selectors = {
id: $(this),
item: $(this).find(".timeline-item"),
activeClass: "timeline-item--active",
img: ".o-timeline__img > img"
};
selectors.item.eq(0).addClass(selectors.activeClass);
selectors.id.css("background-image", "url(" + selectors.item.first().find(selectors.img).attr("src") + ")");
var itemLength = selectors.item.length;
$(window).scroll(function() {
var max, min;
var pos = $(this).scrollTop() + 300;
selectors.item.each(function(i) {
min = $(this).offset().top;
max = ($(this).height() + $(this).offset().top);
var that = $(this)
if (i == itemLength - 2 && pos > min + $(this).height() / 2) {
selectors.item.removeClass(selectors.activeClass);
selectors.id.css("background-image", "url(" + selectors.item.last().find(selectors.img).attr('src') + ")");
selectors.item.last().addClass(selectors.activeClass)
} else if (pos <= max - 40 && pos >= min) {
selectors.id.css("background-image", "url(" + $(this).find(selectors.img).attr('src') + ")");
selectors.item.removeClass(selectors.activeClass);
$(this).addClass(selectors.activeClass);
}
});
});
}
$("#timeline-1").timeline();
}
And the HTML :
<div class="timeline-wrapper timeline1col ">
<div class="timeline-container" id="timeline-1" style="background-image: url("/sites/default/files/2021-01/reunion04-desktop.jpg");">
<div class="timeline">
<div class="timeline-item-wrapper timeline-item">
<div class="timeline-marker"></div>
<div class="timeline__content">
<div class="o-timeline__img timeline-bg">
<img src="/sites/default/files/2021-01/reunion01-desktop.jpg" alt="">
</div>
<p class="timeline__content-date"></p>
<h2 class="timeline__content-title"></h2>
<div class="wysiwyg">
<p>Six personnes, dont une est contaminée, se réunissent dans une.</p>
</div>
</div>
</div>
<div class="timeline-item-wrapper timeline-item">
<div class="timeline-marker"></div>
<div class="timeline__content">
<div class="o-timeline__img timeline-bg">
<img src="/sites/default/files/2021-01/reunion02-desktop.jpg" alt="">
</div>
<p class="timeline__content-date"></p>
<h2 class="timeline__content-title"></h2>
<div class="wysiwyg">
<p>Indépendamment de la distance, <strong>si les cinq autres personnes</strong> passaient quatre heures sans masques</p>
</div>
</div>
</div>
<div class="timeline-item-wrapper timeline-item">
<div class="timeline-marker"></div>
<div class="timeline__content">
<div class="o-timeline__img timeline-bg">
<img src="/sites/default/files/2021-01/reunion03-desktop.jpg" alt="">
</div>
<p class="timeline__content-date"></p>
<h2 class="timeline__content-title"></h2>
<div class="wysiwyg">
<p><strong>Si on utilisait des masques,</strong> ce risque diminuerait jusqu’à quatre contaminations. </p>
</div>
</div>
</div>
<div class="timeline-item-wrapper timeline-item timeline-item--active">
<div class="timeline-marker"></div>
<div class="timeline__content">
<div class="o-timeline__img timeline-bg">
<img src="/sites/default/files/2021-01/reunion04-desktop.jpg" alt="">
</div>
<p class="timeline__content-date"></p>
<h2 class="timeline__content-title"></h2>
<div class="wysiwyg">
<p><strong>Le danger de contamination diminue</strong> jusqu’à moins d’une personne</p>
</div>
</div>
</div>
</div>
https://imgflip.com/gif/4tdd6j OR
https://im.ezgif.com/tmp/ezgif-1-d311b28de417.gif

Make "continue" button appear when items selected and disappear when items unselected

My question is abou make "continue" button appear when items selected and disappear when items unselected using JavaScript.
var typpro = document.getElementsByClassName("typpro"),
continubutton = document.getElementsByClassName("continue");
var w;
for (w = 0; w < typpro.length; w++) {
typpro[w].onclick = function () {
'use strict';
this.classList.toggle("active");
if (this.classList.contains("active")) {
continubutton[0].style.height = "100px";
} else {
continubutton[0].style.height = "0px";
}
};
}
<div class=" col-md-3 col-sm-4 col-xs-6">
<div class="typpro">
<button>Volume Button</button>
</div>
</div>
<div class=" col-xs-12">
<div class="typpro">
<button style="width:98%">Other</button>
</div>
</div>
<div class=" col-xs-12">
<div class="inputpro">
<input type="text" placeholder="your Problem">
</div>
</div>
<div class=" col-xs-12">
<div class="continue">
<button>Continue</button>
</div>
</div>
</div>
</div>

So, you've got a couple of things working against you with your code as it stands.
Firstly, you need to actually define your continubutton variable, like so:
HTML
<button id="continubutton" style="display: none;">Continue</button>
JS:
var continubutton = document.getElementById('continubutton');
Then, you also need to define your typpro variable, like so:
JS:
var typpro = document.getElementsByClassName('typpro');
For what you're trying to do, I went with display: inline and display: none, instead of the height change because there would be a fair amount of additional CSS you would need to do to accomplish this. But here is the final result:
HTML:
<div class=" col-md-3 col-sm-4 col-xs-6">
<div class="typpro">
<button>Screnen</button>
</div>
</div>
<div class=" col-md-3 col-sm-4 col-xs-6">
<div class="typpro">
<button>Battery</button>
</div>
</div>
<button id="continubutton" style="display: none;">Continue</button>
</div>
And the JS:
var w;
var typpro = document.getElementsByClassName('typpro');
var continubutton = document.getElementById('continubutton');
for (w = 0; w < typpro.length; w++){
typpro[w].onclick = function () {
'use strict';
this.classList.toggle("active");
if(this.classList.contains("active")){
continubutton[0].style.display = "inline";
} else {
continubutton[0].style.display = "none";
}
};
}
EDIT: Since using height seems to be the route we need to go, here is updated code:
var w;
var typpro = document.getElementsByClassName('typpro');
var continubutton = document.getElementsByClassName('continue');
for (w = 0; w < typpro.length; w++){
typpro[w].onclick = function () {
'use strict';
this.classList.toggle("active");
if(this.classList.contains("active")){
continubutton[0].style.height = "100px";
} else {
continubutton[0].style.height = "0px";
}
};
}
<div class=" col-md-3 col-sm-4 col-xs-6">
<div class="typpro">
<button>Screnen</button>
</div>
</div>
<div class=" col-md-3 col-sm-4 col-xs-6">
<div class="typpro">
<button>Battery</button>
</div>
</div>
<div class="continue" style="height: 0;overflow:hidden;">
<button id="continubutton">Continue</button>
</div>
</div>
It's important that you set the initial height on your <div class="continue"></div> container, and that you set it to overflow: hidden; so anything that falls outside of the bounding box is hidden from view. This will allow you to animate the height so the button appears "hidden" until an option is selected.

the solution is
for (let btn of typpro) {
btn.addEventListener('click', function() {
let token = 0;
this.classList.toggle('active');
for (let i = 0; i < typpro.length; i += 1) {
if (typpro[i].classList.contains('active')) {
token += 1;
}
}
if (token > 0) {
continubutton[0].style.height = '100px';
} else {
continubutton[0].style.height = '0';
}
});
}

iterating through childs of div with class insides :nth-child in jQuery

i am trying to iterate through the children of the div with class insides.
so far it has been a failure.
here is the html:
<div class="insides">
<div class="pen" style="background-image:url('images/video.png');background-size:cover">
<div class="cover"></div>
<div class="items">
<div class="title">
fullscreen-centered-blurred-video-background
</div>
<div class="desc">
Quick video covers fullscreen with blur effect and grayscale (looping) with working input fields
</div>
<a class="button button-secondary button-small" href="http://codepen.io/peterbs/pen/QpyrMb">
View On CodePen
</a>
</div>
</div>
<div class="pen" style="background-image:url('images/form.png');background-size:cover">
<div class="cover"></div>
<div class="items">
<div class="title">
Loading-form
</div>
<div class="desc">
Simple and fast loading form that is displayed after loading is finished
</div>
<a class="button button-secondary button-small" href="http://codepen.io/peterbs/pen/PpZExY">
View On CodePen
</a>
</div>
</div>
<div class="pen" style="background-image:url('images/horizontal.png');background-size:cover">
<div class="cover"></div>
<div class="items">
<div class="title">
align-vertically
</div>
<div class="desc">
Very easy javascript that aligns children vertically within its parents because css had weak support.
</div>
<a class="button button-secondary button-small" href="http://codepen.io/peterbs/pen/aJNEvB">
View On CodePen
</a>
</div>
</div>
<div class="pen" style="background-image:url('images/navbar.png');background-size:cover">
<div class="cover"></div>
<div class="items">
<div class="title">
navbar-animations
</div>
<div class="desc">
navigation bar with 3 different animations. One more will be coming soon.
</div>
<a class="button button-secondary button-small" href="http://codepen.io/peterbs/pen/dvMpyV">
View On CodePen
</a>
</div>
</div>
</div>
.pen has opacity: 0
and when the user scrolls down a little bit i want them to show 1 by 1.
here is the javascript:
$(document).ready(function(){
window.addEventListener('scroll',function(){
var scroll = $(this).scrollTop();
$('.content').css('transform', 'translateY( '+ scroll / 2 +'px )' );
if(scroll > 120){
for(x = 0; x <= 4 ; x++){
setTimeout(function(){
$('.insides:nth-child('+ x +')').css('opacity','1');
}, 700*x);
}
}else{
for(x = 0; x <= 4 ; x++){
setTimeout(function(){
$('.insides:nth-child('+ x +')').css('opacity','0');
}, 700*x);
}
}
});
var scroll = $(this).scrollTop();
if(scroll > 120){
for(x = 0; x <= 4 ; x++){
setTimeout(function(){
$('.insides:nth-child('+ x +')').css('opacity','1');
}, 700*x);
}
}else{
for(x = 0; x <= 4 ; x++){
setTimeout(function(){
$('.insides:nth-child('+ x +')').css('opacity','0');
}, 700*x);
}
}
});
i honestly have no idea why it is not working. it just doesn't show
here is a jsfiddle: https://jsfiddle.net/f176ch6r/
it doesn't look perfect in the fiddle but it does the job

Two problems here:
the nth-child selector must be applied on your .pen elements
because of the setTimeout all your $('.insides:nth-child('+ x +')') selectors will have the same x
here is what I would write:
window.addEventListener('scroll', _onScroll);
_onScroll();
function _onScroll(){
var x,
scroll = $(this).scrollTop(),
show = scroll > 120;
$('.content').css('transform', 'translateY( '+ scroll / 2 +'px )' );
for(x = 0; x <= 4 ; x++){
_toggle(x, show);
}
}
function _toggle(index, bShow){
setTimeout(function(){
$('.insides .pen:nth-child('+ (index + 1) +')').css('opacity', bShow ? 1 : 0);
}, 700*index);
}
I also updated your jsfiddle

ScrollTop Javascript is not working in Firefox

I am having an issue with my nav bar not working correctly with the ScrollTop Javascript. It works in Chrome and Safari but not Firefox.
This is all the code I currently have on the site. I want the nav bar to follow the scroll once the nav bar is at the top of the page. Please view in Firefox as that is where I am having the issue!
Html
<body>
<div class="container">
<nav class="bottom" id="nav">
<div class="buttonWrapper">
<a href="#about">
<div class="navButton">About</div>
</a>
<a href="#designs">
<div class="navButton">Designs</div>
</a>
<a href="#contact">
<div class="navButton">Contact</div>
</a>
</div>
</nav>
<div class="largeLogo"></div>
</div>
<div class="container about" id="about">
<div class="sideBar about">
<div class="sidebarText"></div>
<p></p>
</div>
</div>
<div class="container designs" id="designs">
<div class="view view-ninth">
<img src="images/11.jpg" />
<div class="mask mask-1"></div>
<div class="mask mask-2"></div>
<div class="content">
<h2>Hover Style #9</h2>
<p>Some Text</p>
Read More
</div>
</div>
<div class="sideBar designs">
<div class="sidebarText"></div>
</div>
</div>
<div class="container contact" id="contact">
<div class="sideBar contact">
<div class="sidebarText"></div>
</div>
</div>
</body>
JavaScript
$(function() {
$('a[href*="#"]:not([href="#"])').click(function() {
if (location.pathname.replace(/^\//, '') === this.pathname.replace(/^\//, '') && location.hostname === this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) + ']');
if (target.length) {
$('html, body').animate({
scrollTop: target.offset().top
}, 1000);
return false;
}
}
});
});
window.addEventListener("scroll", navTop, false);
function navTop() {
var nav = document.getElementById("nav");
var about = document.getElementById("about").offsetTop - 1;
if (document.body.scrollTop > about) {
nav.className = "minimize";
} else {
nav.className = "bottom";
}
}
Fiddle

The issue is with document.body.scrollTop. Try using below code :
function navTop() {
var nav = document.getElementById("nav");
var about = document.getElementById("about").offsetTop - 1;
var scrollTop = $(document).scrollTop();
if (scrollTop > about) {
nav.className = "minimize";
} else {
nav.className = "bottom";
}
}
$(document).scrollTop(); / $(window).scrollTop(); works for both Firefox and Chrome

drag and drop working funny when using variable draggables and droppables

i have some containers that contain some divs like:
<div id="container1">
<div id="task1" onMouseOver="DragDrop("+1+");"> </div>
<div id="task2" onMouseOver="DragDrop("+2+");"> </div>
<div id="task3" onMouseOver="DragDrop("+3+");"> </div>
<div id="task4" onMouseOver="DragDrop("+4+");"> </div>
</div>
<div id="container2">
<div id="task5" onMouseOver="DragDrop("+5+");"> </div>
<div id="task6" onMouseOver="DragDrop("+6+");"> </div>
</div>
<div id="container3">
<div id="task7" onMouseOver="DragDrop("+7+");"> </div>
<div id="task8" onMouseOver="DragDrop("+8+");"> </div>
<div id="task9" onMouseOver="DragDrop("+9+");"> </div>
<div id="task10" onMouseOver="DragDrop("+10+");"> </div>
</div>
i'm trying to drag tasks and drop them in one of the container divs, then reposition the dropped task so that it doesn't affect the other divs nor fall outside one of them
and to do that i'm using the event onMouseOver to call the following function:
function DragDrop(id) {
$("#task" + id).draggable({ revert: 'invalid' });
for (var i = 0; i < nameList.length; i++) {
$("#" + nameList[i]).droppable({
drop: function (ev, ui) {
var pos = $("#task" + id).position();
if (pos.left <= 0) {
$("#task" + id).css("left", "5px");
}
else {
var day = parseInt(parseInt(pos.left) / 42);
var leftPos = (day * 42) + 5;
$("#task" + id).css("left", "" + leftPos + "px");
}
}
});
}
}
where:
nameList = [container1, container2, container3];
the drag is working fine, but the drop is not really, it's just a mess!
any help please??
when i hardcode the id and the container, then it works beautifully, but as soon as i use id in drop then it begins to work funny!
any suggestions???
thanks a million in advance
Lina

Consider coding it like this:
<div id="container1" class="container">
<div id="task1" class="task">1 </div>
<div id="task2" class="task">2 </div>
<div id="task3" class="task">3 </div>
<div id="task4" class="task">4 </div>
</div>
<div id="container2" class="container">
<div id="task5" class="task">5 </div>
<div id="task6" class="task">6 </div>
</div>
<div id="container3" class="container">
<div id="task7" class="task">7 </div>
<div id="task8" class="task">8 </div>
<div id="task9" class="task">9 </div>
<div id="task10" class="task">10 </div>
</div>
$(function(){
$(".task").draggable({ revert: 'invalid' });
$(".container").droppable({
drop: function (ev, ui) {
//process dropped item
}
});
})