Page height to 100% of viewport?

Question

Here’s just a simplified code example of the HTML:

<div id="welcome">
    your content on screen 1
</div>
<div id="projects">
    your content on screen 2
</div>

and here’s the CSS using vh:

div#welcome {
    height: 100vh;
    background: black;
}

div#projects {
    height: 100vh;
    background: yellow;
}

From Here: http://stanhub.com/how-to-make-div-element-100-height-of-browser-window-using-css-only/

It works for me.