<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <div>
    <ul>
      <li>
        <a href="#">1</a>
        <a href="#">2</a>
        <a href="#">3</a>
        <a href="#">4</a>
        <a href="#">5</a>
      </li>
    </ul>
  </div>
  
   <nav>
    <ul>
      <li>
        <a href="#">1</a>
        <a href="#">2</a>
        <a href="#">3</a>
        <a href="#">4</a>
        <a href="#">5</a>
      </li>
    </ul>
  </nav>
</body>
</html>
$size: 3em;
$color: blueviolet;
$color-hover: red;

/* Nesting with SCSS */
nav {
  ul li {
    background-color: lime;
    text-decoration: none;
  }
  a {
    font-weight: bold;
    &:hover {
      color: $color-hover;
      font-size: $size;
    }
  }
}

/* Normal CSS */
a {
   font-size: $size;
   color: $color;
   text-decoration: none;
}
a:hover{
   color: green;
   font-size: 2em;
}
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External CSS

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External JavaScript

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