HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS display-mode Install Banner</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      margin: 0;
    }

    .install-banner {
      display: flex;
      padding: 0.75rem 1rem;
      background: #eff6ff;
      border: 1px solid #93c5fd;
      border-radius: 0.5rem;
      font-size: 0.875rem;
      max-width: 22rem;
    }

    @media (display-mode: standalone),
           (display-mode: fullscreen) {
      .install-banner {
        display: none;
      }
    }
  </style>
</head>
<body>
  <h1>My PWA</h1>
  <div class="install-banner">
    Install this app for the best experience
  </div>
  <p>Banner visible in browser mode only.</p>
</body>
</html>

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CSS display-mode - Hide Install Banner