<!doctype html>
<html lang="ko">
  <head>
    <meta charset="utf-8">
    <title>CSS</title>
    <button>link</button>
  </body>
</html>
button{
  background-color : red;
  color : white;
}
button:hover {
  background-color : black;
  color : white;
}    
button:active {
  background-color :yellow;
}
button:focus {
  color: yellow;
}

External CSS

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External JavaScript

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