CSS Property: text-decoration-thickness

The text-decoration-thickness property sets the thickness of the decorative line.

EXAMPLE

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>how to set decorative line thickness</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

    <style>
        * {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            padding: 30px;
            height: 100%;
            width: 100%;
        }
        p.a {
            text-decoration-color: blue;
            text-decoration-line: underline;
            text-decoration-style: solid;
            text-decoration-thickness: auto;
        }
        p.b {
            text-decoration-color: greenyellow;
            text-decoration-line: underline;
            text-decoration-style: wavy;
            text-decoration-thickness: 2px;
        }
        p.c {
            text-decoration-color: orange;
            text-decoration-line: underline;
            text-decoration-style: dotted;
            text-decoration-thickness: 10%;
        }
        p.d {
            text-decoration-color: lightblue;
            text-decoration-line: underline;
            text-decoration-style: dashed;
            text-decoration-thickness: 5px;
        }
        p.f {
            text-decoration-color: mediumpurple;
            text-decoration-line: underline;
            text-decoration-style: double;
            text-decoration-thickness: 3px;
        }
        /* write it faster */
        p.g {
            text-decoration: underline 2px solid red;
        }
    </style>
</head>
<body>
    <p class="a">Welcome to CSS tutorial!</p>
    <p class="b">Welcome to CSS tutorial!</p>
    <p class="c">Welcome to CSS tutorial!</p>
    <p class="d">Welcome to CSS tutorial!</p>
    <p class="f">Welcome to CSS tutorial!</p>
    <p class="g">Welcome to CSS tutorial!</p>
</body>
</html>

RESULT