css-series/04-Box Model (Core Foundation).html at main · jdcodebase/css-series · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>CSS Box Model - Basic Example</title>

    <style>
      .box {
        width: 300px;
        background: lightblue;
        padding: 20px;
        border: 5px solid blue;
        margin: 20px;
      }

      .border-box {
        width: 300px;
        background: lightgreen;
        padding: 20px;
        border: 5px solid green;
        margin: 20px;
        box-sizing: border-box;
      }
    </style>
  </head>

  <body>
    <h1>CSS Box Model</h1>

    <h3>Default: content-box</h3>
    <div class="box">
      width = 300px <br />
      padding = 20px <br />
      border = 5px <br /><br />

      Total width = 300 + 20 + 20 + 5 + 5 = 350px
    </div>

    <h3>box-sizing: border-box</h3>
    <div class="border-box">
      width = 300px <br />
      padding = 20px <br />
      border = 5px <br />
      box-sizing = border-box <br /><br />

      Total width = 300px (padding + border included)
    </div>
  </body>
</html>