Question: I'm trying to emulate this site.

<https://elrumordelaluz.github.io/csshake/>

Each Color is a different section, and all sections are based on the height of the screen. Is there anyway to implement this w/ out just copying the demo.css? Just want a simple bare bones implementation of what is going on.

Answer: 
Does this do the job for you? <https://jsfiddle.net/0ds7fLce/>
The vh unit is part of the CSS3 specification, it represents a percentage of the height of your viewport.

```
.myclass {
    height: 100vh;
}

```

Should do the trick.
I believe using percentages instead of vh is better, because of older browser support:

<http://codepen.io/yonimor/pen/MKoGBj>

```
<div class="first"></div>
<div class="second"></div>

html, body {
  height: 100%;
}

.first {
  height: 100%;
  background: red;
}

.second {
  height: 100%;
  background: yellow;
}

```