CodePen Embed - CSS Custom Propertieas

<h1>Custom Properties</h1>
<a href="#">Chapter 1</a>
<a href="#">Chapter 2</a>
<a href="#">Chapter 3</a>

:root{
  --spacing: 1rem;
  --primary-color: #BF0204;
}
h1{
  border-bottom: 2px solid var(--primary-color);
}
a{
  color: inherit;
  padding: var(--spacing);
  border: 1px solid var(--primary-color);
}

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