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<!DOCTYPE html>
<html>
<head>
<style>
body {
  background-color:#E7E9EB;
}
#myDIV {
  width:100%;
  height:300px;
  background-color:#FFFFFF;
  border-left:5px solid;
  border-left-width: thick;
}
</style>
</head>
<body>
<h1>The border-left-width Property</h1>
<div id="myDIV">
A demonstration on how to set the left border width.
</div>
</body>
</html>