JavaScript Why cannot apply style using CSS class in JS function? word cannot apply style,cannot apply paragraph style

In this code the function sayHi() doesn't write text with style. Why? How do I apply CSS class to a document.write in a function?

.class1 {
  color: red;
  font-size: 400%;
}

<script language="javascript" type="text/javascript">
  document.write("<h1 class=class1>Hello World</h1>");

  function sayHi() {
    document.write("<h1 class=class1>Goodbye!</h1>");
  }
</script>

<button onclick="sayHi()">Click me</button>

Answer:1

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