HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS light-level Theme Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      margin: 0;
    }

    @media (light-level: normal) {
      body {
        background-color: #fff;
        color: #1e293b;
      }
    }

    @media (light-level: dim) {
      body {
        background-color: #1e293b;
        color: #f8fafc;
      }
    }

    @media (light-level: washed) {
      body {
        background-color: #e2e8f0;
        color: #334155;
      }
    }
  </style>
</head>
<body>
  <h1>Light Level Example</h1>
  <p>Background adapts to ambient lighting when sensors are supported.</p>
</body>
</html>

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CSS light-level - Background by Light Level