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Hướng dẫn tạo filter list với Javascript - Thêm CSS RUN

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <style>
          * {
            box-sizing: border-box;
          }
          .container {
            width: 500px;
            margin: auto;
          }

#myInput {
            background-position: 10px 12px;
            background-repeat: no-repeat;
            width: 100%;
            font-size: 16px;
            padding: 15px;
            border: 1px solid #ddd;
            margin-bottom: 12px;
          }

#myUL {
            list-style-type: none;
            display: none;
            padding: 0;
            margin: 0;
          }

#myUL li a {
            border: 1px solid #ddd;
            margin-top: -1px; 
            background-color: #f6f6f6;
            padding: 12px;
            text-decoration: none;
            font-size: 18px;
            color: black;
            display: block
          }

#myUL li a.header {
            background-color: #e2e2e2;
            cursor: default;
          }
          
          #myUL li a:hover:not(.header) {
            background-color: #eee;
          }
        </style>
    </head>
    <body> 
      <div class="container">
        <h2>Freetuts.net hướng dẫn tạo Filter List</h2>

<ul id="myUL">
          <li><a href="#">Athens</a></li>
          <li><a href="#">Amsterdam</a></li>
          <li><a href="#">Atlanta</a></li>
          <li><a href="#">Alaska</a></li>
          <li><a href="#">Barcelona</a></li>
          <li><a href="#">Bologna</a></li>
          <li><a href="#">Berlin</a></li>
          <li><a href="#">Bordeaux</a></li>
          <li><a href="#">Copenhagen</a></li>
          <li><a href="#">Cardiff</a></li>
          <li><a href="#">Caen</a></li>
          <li><a href="#">Cannes</a></li>
        </ul>
      </div>
    </body>
</html>