Full Page Gradient Background

This is a simple snippet to make a full page gradient background using CSS. All you need is to write a simple CSS file with this code:

html {
 background: #red; /* fallback color */
 background: linear-gradient( to bottom, #red, #blue);
 background-repeat: no-repeat;
 background-size: cover;
 width: 100%;
 height: 100%;
}

And link it in your main html/php file!