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<h1>
  The Great Barrier Reef
</h1>
<p>
  The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching over 2,300 kilometers.
</p>

h1 {
  color: red;
}

p {
  color: blue;
  font-size: 20px;
}

<h1 style="color: red">
  The Great Barrier Reef
</h1>
<p style="color: blue; font-size: 20px">
  The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching over 2,300 kilometers.
</p>