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Change text in fixed div as you scroll through website

I'm trying to get the text in the fixed div to change as you scroll past the main divs that contain the images. I tried following the solution in Changing div content based on scroll position but it won't work. Here is my attempt using that method: http://jsfiddle.net/st6q1Lmo/5/.
I'm a beginner so it's hard for me to write code from scratch. I must be doing something wrong... I would appreciate any help. Thank you!
This is my HTML and CSS without any JS (http://jsfiddle.net/7tdnw1eb/6/):
UPDATE: Thanks to the lead #tera_789 gave me, I've almost got it to work. For the first and third div it works, but for the second the content won't update in the fixed div. I know it could be because the video is only 90vh and the video itself won't scroll in the container... However I need it to be 90vh. How can I get around this? jsfiddle.net/7tdnw1eb/12
body {
background-color: #797979;
color: black;
font-family: serif;
font-size: 2vw;
line-height: 1.1em;
}
#about {
padding-bottom: 1em;
}
#wrapper {
max-width: 100vw;
max-height: 100vh;
overflow: scroll;
padding-top: 1em;
padding-bottom: 1em;
}
.project {
background-color: transparent;
width: 100vw;
height: 100vh;
position: sticky;
top: 0;
padding: 0 2em;
overflow: scroll;
}
.content__container {
width: 100%;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
#count {
color: black;
width: 20%;
display: block;
position: fixed;
top: 0;
right: 0;
padding: 1em 2em 2em 0;
z-index: 99999999999;
}
img {
max-width: 100%;
}
<div id="wrapper">
<div id="count">
<p>1/3</p>
</div>
<div id="about">
Wassup everyone
</div>
<div class="project">
<div class="content__container">
<img src="https://www.what-dog.net/Images/faces2/scroll001.jpg">
</div>
</div>
<div class="project">
<div class="content__container">
<img src="https://static.boredpanda.com/blog/wp-content/uploads/2017/09/funny-dog-thoughts-tweets-1.jpg">
</div>
</div>
<div class="project">
<div class="content__container">
<img src="https://ksrpetcare.com/wp-content/uploads/2017/04/41059-Cute-Yellow-Labrador-puppy-in-play-bow-white-background.jpg">
</div>
</div>
</div>

Take a look at this: onscroll event

Adding content to div causes it to shift?

In the following code, I have a simple page setup, but as soon as I add something to the div with class page the whole main page div shifts downwards?
try adding <h1>hello</h1> to the div with class page.
what is the problem, the div should remain there and simply <h1>hello</h1> should be added!
code: https://jsfiddle.net/5sx0sj2q/
.container{
width: 100%;
background-color: #d5d5d5;
}
.sidebarcontainer{
width: 300PX;
height: 2000px;
display: inline-block;
box-sizing: border-box;
padding: 5px;
padding-right: 2px;
}
.innersidebarcontainer{
position: relative;
width: 100%;
height: 100%;
}
.sidebar{
width: 293px;
background-color: white;
height: 500px;
top: 1px;
position: absolute;
}
.mainpage{
width: calc(100% - 300px);
padding: 5px;
padding-left: 2px;
height: 2000px;
display: inline-block;
box-sizing: border-box;
}
.page{
width: 100%;
height: 100%;
background-color: white;
}
.footer{
height: 500px;
width: 100%;
margin: 0 auto;
background-color: #031003;
}
<div class="container">
<div class="sidebarcontainer">
<div class="innersidebarcontainer">
<div class="sidebar">
</div>
</div>
</div><!--
--><div class="mainpage">
<div class="page"></div>
</div>
</div>
<div class="footer"></div>

Yes there's a trick for that :
.mainpage{
vertical-align : top; // Add this
}
Also, change the H1 display property :
h1{
display : inline-block;
}
All the elements stay up where they should be. The joys of CSS.
Working Fiddle

Is normal, display: inline-block add a little space between elements (and you have no more space).
Use float left instead and your code works.

How to fix an element to the right of div?

I have a button which i want to fix it's position to the right of a div, the button is toggling the visibility of it's left div, problem is the button loses it's position once the resolution is changing...
Here is an Example
And here is what I've done so far:
$('.results_toggle').on('click', function() {
$(this).toggleClass('left_hide');
$('.left').toggle();
});
.cont {
width: 100vw;
}
.left {
position: relative;
width: 50vw;
height: 100vh;
background-color: grey;
float: left;
border-left: 2px solid white;
}
.right {
height: 100vh;
width: 50vw;
float: left;
}
.results_toggle:before {
content: "\f054";
font-family: FontAwesome;
font-style: normal;
font-weight: normal;
text-decoration: inherit;
color: black;
font-size: 24px;
padding-right: 0.5em;
position: absolute;
top: 14px;
left: 5px;
}
.results_toggle {
background-color: grey;
height: 60px;
width: 30px;
position: absolute;
z-index: 106;
top: 45vh;
right: 223px;
border-bottom-right-radius: 110px;
border-top-right-radius: 110px;
border-bottom: 0;
}
.left_hide {
left: 0px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="cont">
<div class="left">
</div>
<div class="results_toggle">
<!-- the button -->
</div>
<div class="right">
</div>
</div>

The simplest solution to this would be to put the toggle within the .right div, and position it at left: 0 so that it is always adjacent to the .left div, something like this:
<div class="cont">
<div class="left"></div>
<div class="right">
<div class="results_toggle"></div>
</div>
</div>
.right {
position: relative; /* add this */
}
.results_toggle {
/* remove 'right' */
left: 0; /* add this */
}
Working example
The advantage of this method is that it will be completely unaffected by any change in screen resolution.

You use viewport units , so the values of them will change when changing the viewport size ( resolution ) .
If you want the arrow to stay in the middle ( and so, on the right side of the grey div ) , you should center it this way
See snippet below
$('.results_toggle').on('click', function() {
$(this).toggleClass('left_hide');
$('.left').toggle();
});
.cont {
width: 100vw;
}
.left {
position: relative;
width: 50vw;
height: 100vh;
background-color: grey;
float: left;
border-left:2px solid white;
}
.right {
height: 100vh;
width: 50vw;
float: left;
}
.results_toggle:before {
content: "\f054";
font-family: FontAwesome;
font-style: normal;
font-weight: normal;
text-decoration: inherit;
color: black;
font-size: 24px;
padding-right: 0.5em;
position: absolute;
top: 14px;
left: 5px;
}
.results_toggle {
background-color: grey;
height: 60px;
width: 30px;
position: absolute;
z-index: 106;
top: 50%;
right:50%;
transform:translate(100%,-50%);
border-bottom-right-radius: 110px;
border-top-right-radius: 110px;
border-bottom: 0;
}
.left_hide{
left:0px;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="cont">
<div class="left">
</div>
<div class="results_toggle">
</div>
<div class="right">
</div>
</div>

For me the best approach to align elements is to use Flexbox attributes. With those attributes, you can place element as boxes in a row, column...In your case you have a main box .cont with a left side and a right side. This is the result with a Flexbox placement :
The main div is represented by the red background. Inside you have your left div and aligned with your right button.
Here is the code to make this :
<html>
<head>
<meta charset='utf-8' />
<style type="text/css">
.cont
{
display: flex;
align-items: center;
background-color: red;
color: white;
}
.left
{
background-color: blue;
margin: 5px;
}
button
{
background-color: green;
}
</style>
</head>
<body>
<div class="cont">
<div class="left">
<p>Left div</p>
</div>
<div class="results_toggle">
<button>Right button</button>
</div>
<div class="right"></div>
</div>
</body>
</html>

not sure if that's what you meant, but i simply changed the leftattribute of the button to 50vw, the same as your grey box.
Here's a fiddle
edit:
another option: position: relative and float: left without left or right property
updated fiddle

It's because you've fixed each property.
You can fix an element at the right of his parent using absolute and relative position. And add the width of you child.
Example
.parent{
width:200px;
height:200px;
background-color:#ccc;
position:relative;
}
.child{
position:absolute;
right:0;
top:100px;
transform:translateX(100%) translateY(-50%);
}
<div class="parent">
<button class="child">btn</button>
</div>

:hover feature like Chrome Developer Tools

I want to add a z-index of 1 on individual divs, buttons, and h1 that are underneath an overlay. I'm trying to make it similar to the chrome developer tools :hover feature. In Dev Tools, when you hover over an individual element, it highlights, however in my case, I'd like it to come above the overlay. In dev tools, you can highlight a child div without it's parent highlighting, and that's what I'm looking to do too.
I've tried messing with opacity, but when it has a nested div, the nested div gets double the opacity and I don't want that. Here's the codepen and the code...
http://codepen.io/jareko999/pen/wWGpwz
HTML
<div class="cover">
</div>
<h1 class="title">Here's your website</h1>
<div class="container">
<div class="box">
<button>The Button</button>
</div>
<div class="box">
<button>The Button</button>
</div>
<div class="box">
<button>The Button</button>
</div>
<div class="box">
<button>The Button</button>
</div>
<div class="box">
<button>The Button</button>
</div>
<div class="box">
<button>The Button</button>
</div>
</div>
CSS
body {
margin: 0;
width: 100%;
height: 100%;
}
.cover {
position: absolute;
width: 100vw;
height: 100vh;
top: 0;
left: 0;
background: rgba(0,0,0,.4);
z-index: 1;
}
.title {
text-align: center;
width: 60%;
margin: 40px auto;
}
.container {
margin: auto;
display: flex;
flex-wrap: wrap;
justify-content: center;
}
.box {
width: 300px;
height: 200px;
margin: 10px;
background: url("https://static.pexels.com/photos/38155/pexels-photo-38155.jpeg") center center no-repeat;
background-size: cover;
display: flex;
}
button {
-webkit-appearance: none;
border: none;
box-shadow: none;
background: #276cd6;
color: white;
font-weight: 600;
font-size: .8em;
padding: 16px 24px;
border-radius: 10px;
margin: auto;
}

Centering CSS Boxes(Html and Css)

I am trying to center these boxes in the middle of the screen both horizontally and vertically. Another question is how can I make it where it re-sizes automatically when I scale my page?
/*-------------------------
Simple reset
--------------------------*/
*{
margin:0;
padding:0;
}
/*-------------------------
General Styles
--------------------------*/
/*----------------------------
Color Themes
-----------------------------*/
.nav-colors{
position: relative;
background: white;
height: 200px;
width: 60%;
margin: 0 auto;
padding: 20px;
overflow: auto;
}
.home-link{
background-color:#00c08b;
width: 15%;
height: 80px;
display: inline-block;
margin-left: 10%;
}
.portfolio-link{
background-color:#ea5080;
width: 15%;
height: 80px;
display: inline-block;
}
.social-link{
background-color:#53bfe2;
width: 15%;
height: 80px;
display: inline-block;
}
.contact-link{
background-color:#f8c54d;
width: 15%;
height: 80px;
display: inline-block;
}
.blog-link{
background-color:#df6dc2;
width: 15%;
height: 80px;
display: inline-block;
}
<!DOCTYPE html>
<html>
<head>
<title>Neiko Anglin | Front-End Develper </title>
<!-- Our CSS stylesheet file -->
<link rel="stylesheet" href="css/styles.css" />
<!-- Font Awesome Stylesheet -->
<link rel="stylesheet" href="font-awesome/css/font-awesome.css" />
</head>
<body>
<div class="nav-colors">
<div class="home-link">
</div>
<div class="portfolio-link">
</div>
<div class="social-link">
</div>
<div class="contact-link">
</div>
<div class="blog-link">
</div>
</div>
</body>
</html>

You can use absolute positioning on the container to center vertically and horizontally:
/*-------------------------
Simple reset
--------------------------*/
* {
margin:0;
padding:0;
}
/*-------------------------
General Styles
--------------------------*/
/*----------------------------
Color Themes
-----------------------------*/
.nav-colors {
position: absolute;
background: white;
height: 84px;
width: 60%;
margin: auto;
padding: 20px;
overflow: auto;
top:0;
right:0;
bottom:0;
left:0;
}
.home-link {
background-color:#00c08b;
width: 15%;
height: 80px;
display: inline-block;
margin-left: 10%;
}
.portfolio-link {
background-color:#ea5080;
width: 15%;
height: 80px;
display: inline-block;
}
.social-link {
background-color:#53bfe2;
width: 15%;
height: 80px;
display: inline-block;
}
.contact-link {
background-color:#f8c54d;
width: 15%;
height: 80px;
display: inline-block;
}
.blog-link {
background-color:#df6dc2;
width: 15%;
height: 80px;
display: inline-block;
}
<div class="nav-colors">
<div class="home-link"></div>
<div class="portfolio-link"></div>
<div class="social-link"></div>
<div class="contact-link"></div>
<div class="blog-link"></div>
</div>

To align vertically you need a wrapper class with position absolute in CSS. Search for vertical center which will fetch you lots of results.
To resize boxes along with screen resize - is responsive template. I could suggest you to use Twitter Bootstrap which takes care of your dimensions.

Change your .nav-color class to
.nav-colors{
position: fixed;
background: white;
height: 80px;
width:60%;
margin: -60px 0 0 0;
padding: 20px;
overflow: auto;
top:50%;
left:20%;
}
/*-------------------------
Simple reset
--------------------------*/
* {
margin: 0;
padding: 0;
}
/*-------------------------
General Styles
--------------------------*/
/*----------------------------
Color Themes
-----------------------------*/
.nav-colors {
position: fixed;
background: white;
height: 80px;
width: 60%;
margin: -60px 0 0 0;
padding: 20px;
overflow: auto;
top: 50%;
left: 20%;
}
.home-link {
background-color: #00c08b;
width: 15%;
height: 80px;
display: inline-block;
margin-left: 10%;
}
.portfolio-link {
background-color: #ea5080;
width: 15%;
height: 80px;
display: inline-block;
}
.social-link {
background-color: #53bfe2;
width: 15%;
height: 80px;
display: inline-block;
}
.contact-link {
background-color: #f8c54d;
width: 15%;
height: 80px;
display: inline-block;
}
.blog-link {
background-color: #df6dc2;
width: 15%;
height: 80px;
display: inline-block;
}
<div class="nav-colors">
<div class="home-link">
</div>
<div class="portfolio-link">
</div>
<div class="social-link">
</div>
<div class="contact-link">
</div>
<div class="blog-link">
</div>
</div>

You just have to add some properties to your .nav-colors:
.nav-colors{
position: relative;
background: white;
height: 200px;
width: 60%;
margin: 0 auto;
padding: 20px;
overflow: auto;
line-height: 200px;
text-align: center;
}
And add vertical-align: middle; to elements you want to center vertically.

First the explanation, then some code.
Vertical centering is a classic css issue. The vh unit has come in very handy for this recently. Coupled with margin (and maybe calc) its now a solvable thing.
Centering it horizontally is simple enough, and you have that figured out. Just have a width and set margin: 0 auto and you are good to go.
With Vertical Centering the key thing to remember is you are centering your element, so half is over the middle, half is under the middle. With that we can make margin: calc(50vh-40px) auto 0 for your 80px high element and presto, it's in the middle vertically.
One step further:
Like horizontal centering, you seem to already have the dynamic width down by using %.
For a dynamic vertical size we can again turn to vh. The nice thing is this saves us the css calc function. Just subtract half the height from the 50vh margin and you'll get your margin. So for height: 20vh the margin is margin: 40vh auto 0
Here is a JsFiddle
and here is some code:
CSS:
*{
margin: 0;
padding: 0;
}
html, body{
width: 100vw;
height: 100vh;
}
.nav-colors{
width: 80%;
height: 20vh;
margin: calc(40vh) auto 0;
}
.nav-colors div{
width: 18%;
margin: 0 0 0 1%;
height: 100%;
display: inline-block;
}
.home-link{background-color:#00c08b;}
.portfolio-link{background-color:#ea5080;}
.social-link{background-color:#53bfe2;}
.contact-link{background-color:#f8c54d;}
.blog-link{background-color:#df6dc2;}
HTML:
<div class="nav-colors">
<div class="home-link"></div>
<div class="portfolio-link"></div>
<div class="social-link"></div>
<div class="contact-link"></div>
<div class="blog-link"></div>
</div>
enjoy.