css-cookbook/sticky-footer.html

<!doctype html>

<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width" />

    <title>CSS Cookbook: sticky footer</title>

    <link rel="stylesheet" href="styles.css" />

    <style>
      html {
        height: 100%;
        box-sizing: border-box;
      }

      * {
        box-sizing: inherit;
      }

      body {
        height: 100%;
      }

      .page-header,
      .page-footer {
        background-color: rgb(75 70 74);
        color: #fff;
        padding: 20px;
      }

      .page-body {
        padding: 20px;
      }

      .preview {
        height: 100%;
        overflow: auto;
      }
    </style>

    <style class="editable">
      .wrapper {
        min-height: 100%;
        display: grid;
        grid-template-rows: auto 1fr auto;
      }
    </style>
  </head>

  <body>
    <section class="preview">
      <div class="wrapper">
        <header class="page-header">This is the header</header>
        <main class="page-body">
          <p>
            Main page content here, add more if you want to see the footer push
            down.
          </p>
        </main>
        <footer class="page-footer">Sticky footer</footer>
      </div>
    </section>

    <textarea class="playable playable-css">
.wrapper {
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
}</textarea
    >

    <textarea class="playable playable-html">
<div class="wrapper">
  <header class="page-header">This is the header</header>
  <article class="page-body">
    <p>Main page content here, add more if you want to see the footer push down.</p>
  </article>
  <footer class="page-footer">Sticky footer</footer>
</div></textarea
    >

    <div class="playable-buttons">
      <input id="reset" type="button" value="Reset" />
    </div>
  </body>
  <script src="playable.js"></script>
</html>