aspect-ratio with padding-bottom technique

by rafi_sakib

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
  <div class="demoWrapper">
    <div></div>
  </div>
</body>
</html>

CSS

#flexbox {
}

.demoWrapper {
  padding: 0px;
  background: white;
  box-sizing: border-box;
  border: 1px dashed;
  overflow: auto;
  max-width: 100%;
  height: auto;
}

div {
  width: 100%;
  padding-bottom: 75%; /* For a 4:3 aspect ratio */
  background: gold; /* For the demo */
}