Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Abstract Art</title>
<style id="jsbin-css">
.box-1 {
    background-color: red;
    height: 100px;
    width: 300px;
}


.box-2 {
    background-color: green;
    height: 400px;
    width: 750px;
}

.box-3 {
    background-color: blue;
    height: 990px;
    width: 100px;
}
</style>
</head>
<body>

<script id="jsbin-javascript">
for (var i = 1; i < 4; i++) {
  var boxElement = document.createElement('div');
  boxElement.className = 'box-' + i;
  document.getElementsByTagName('body')[0].appendChild(boxElement);
}
</script>


<script id="jsbin-source-css" type="text/css">
.box-1 {
    background-color: red;
    height: 100px;
    width: 300px;
}


.box-2 {
    background-color: green;
    height: 400px;
    width: 750px;
}

.box-3 {
    background-color: blue;
    height: 990px;
    width: 100px;
}
</script>

<script id="jsbin-source-javascript" type="text/javascript">for (var i = 1; i < 4; i++) {
  var boxElement = document.createElement('div');
  boxElement.className = 'box-' + i;
  document.getElementsByTagName('body')[0].appendChild(boxElement);
}</script></body>
</html>