Set Border Width

Border styles include border width, border color, and border style.
::: normal-demo Demo of Border Styles

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <style type="text/css">
        #div1 { border-width: 10px; border-color: red; border-style: solid; }
        #div2 { border-width: 20px; border-color: green; border-style: solid; }
    </style>
</head>
<body>
    <div id="div1">123</div>
    <div id="div2">123</div>
</body>
</html>

:::