Responsive Div maintain aspect ratio

by Josh Weir

HTML

<div class = "wrapper">
    <div class = "main">
        I'm your div with an aspect-ratio of 16:9! <a href = "https://en.wikipedia.org/wiki/Glee_%28TV_series%29">Glee</a> is great!
    </div>
</div>

CSS

html, body {
 height: 100%;
 width: 100%;    
}
.wrapper {
 width: 50%;
 display: inline-block;
 position: relative;
}
.wrapper:after {
    padding-top: 56.25%; /*16:9 ratio*/
    display: block;
    content: '';
}
.main {
    position: absolute;
    top: 0; bottom: 0; right: 0; left: 0; /*fill parent*/
    background-color: rgb(0, 162, 232);
    /*I wanted it to look good :)*/
    font-family: 'Arial', Helvetica, Sans-Serif;
    color: white;
}
/*more irrelevant prettiness*/
a {
 text-decoration: none;
 font-weight: bold; 
 color: white;
}
a:hover {
 text-decoration: underline;   
}