Preview:
<style>
.heading {
  font-family: sans-serif;
  font-weight: 700;
}
.warning {
  color: yellow;
}
.danger {
  color: red;
}
.info {
  color: blue;
}
</style>

<body>
<h1 class="heading warning">...</h1>
<h2 class="heading danger">...</h2>
<h3 class="heading info">...</h3>
</body>
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