Responsive div with aspect ratio

by audetwebdesign

HTML

<div class="wrapper">
    <div class="inner">Inner content...</div>
</div>

CSS

html, body {
    height: 100%;
}
body {
    margin: 0;
}
.wrapper {
    background-color: lightblue;
    height: 100%;
}
.wrapper .inner {
    margin: 0 auto;
    background-color: beige;
    height: 100%;
    width: 66.6666666666vh;
}