css-series/15-Responsive Design & Media Queries.html at main · jdcodebase/css-series · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>15 - Responsive Design & Media Queries</title>

    <style>
      /* Reset */
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      h1 {
        margin-bottom: 20px;
      }

      /* Container */
      .container {
        display: flex;
        gap: 20px;
      }

      /* Box */
      .box {
        background: lightblue;
        padding: 40px;
        flex: 1;
        text-align: center;
        font-size: 24px;
      }

      /* Mobile / Tablet */
      @media (max-width: 768px) {
        .container {
          flex-direction: column;
        }

        .box {
          background: yellowgreen;
          font-size: 18px;
        }
      }

      /* Desktop */
      @media (min-width: 768px) {
        .container {
          flex-direction: row;
        }

        .box {
          background: red;
        }
      }
    </style>
  </head>

  <body>
    <h1>Responsive Design Demo</h1>

    <div class="container">
      <div class="box">Box 1</div>
      <div class="box">Box 2</div>
      <div class="box">Box 3</div>
    </div>
  </body>
</html>