CSS Properties: How to set the width and length of the bottom border?

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HTML Code:

<!DOCTYPE html>
<title>How to set the width of the bottom border</title>
h1  {
    border-style: solid;
    border-bottom-width: 15px;
<h1>CSS, stands for Cascading Style Sheet is a computer language to describe presentation.</h1>

Live Demo:

See the Pen border-bottom-width-length-answer by w3resource (@w3resource) on CodePen.

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