Untitled

<!DOCTYPE html>
<html>
<head>
  <title>Warning Message</title>
  <style>
    body {
      background-color: black;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
    }

    .warning-message {
      color: red;
      font-size: 3em;
      font-weight: bold;
      animation: blink 1s infinite;
    }

    @keyframes blink {
      50% {
        opacity: 0;
      }
    }
  </style>
</head>
<body>
  <div class="warning-message">WARNING! Do not reboot</div>
</body>
</html>
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