<body class="dark">
  <header class="header">
    <div class="grid">
      <nav class="navigation">
        <ul>
          <li>
            <a href="#">Overview</a>
          </li>
          <li>
            <a href="#">Why iPad</a>
          </li>
          <li>
            <a href="#">Tech Specs</a>
          </li>
        </ul>
      </nav>
    </div>
  </header>
</body>
@use postcss-preset-env;

* {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
}

body {
  background-image: url('https://www.apple.com/v/ipad-pro/ac/images/overview/ipados_hero_background__eatvmloptd26_medium.jpg');
  background-size: cover;
  background-position: 50%;
  font-family: 'Helvetica Neue';
  line-height: 1.5;
  margin: 0;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.header {
  position: sticky;
  top: 0;
  left: 0;
  padding-top: 1em;
  padding-bottom: 1em;
  
  background-color: rgba(245,245,247,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  
  border-bottom: 1px solid rgba(0,0,0,0.16);
}

.dark .header {
  background-color: rgba(29,29,31,0.72);
  border-color: rgba(255,255,255,0.24);
  color: #fff;
}

.grid {
  margin-left: auto;
  margin-right: auto;
  max-width: 1440px;
  width: 90%;
}

.navigation ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1em;
}
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