Bootstrap-Examples/borderwidth.html at main · suman-shah/Bootstrap-Examples · GitHub

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<!DOCTYPE html>
<html>
<head>
<style>
h1 {
  border-bottom-style: solid;
  border-bottom-width: thin;
}

div {
  border-style: solid;
  border-bottom-width: thin;
}
</style>
</head>
<body>

<h1>A heading with a thin bottom border</h1>

<div>A div element with a thin bottom border.</div>

<p><strong>Note:</strong> Always declare the border-bottom-style or the border-style property before the border-bottom-width property. An element must have a border before you can change the color.</p>

</body>
</html>