    <!DOCTYPE html>
    <html>
    <head>
      <meta charset="UTF-8">
      <title>클릭으로 함수 호출하기</title>
      <link rel="stylesheet" href="style_js.css">
    </head>
    <body>
      <h1 id="alter" onclick="change()">Change Colors</h1>
      <script>
        function change() {
          const alter = document.getElementById("alter");
          alter.style.background = "aqua";
        }
      </script>
    </body>
    </html>