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HTML

<html>
  <head>
    <title> Superstar </title>
  </head>
  <body style="background-color:darkorchid";>
    <h1> Superstar </h1>
    <p> Movies </p>
    <ol>
      <li> The Incredibles </li>
      <li> Star Wars </li>
      <li> Harry Potter </li>
      <li> Despicable Me </li>
      <li> Lego Batman </li>
      <div class="hello" id="add_book">
        <p>
          hello world
        </p>
      </div>
      <div class="hello" id="even_book">
        <p>
          hello world
        </p>
      </div>
      <img src="https://cdn.thecrazytourist.com/wp-content/uploads/2015/11/Sunset-in-Sun-Flower-Field-Maryland.jpg" height=100/>
    </ol>
  </body>
</html>

CSS

.hello{
  background-color: yellow;
  font-size:15;
  
}

#add_book {
  color: blue;
}

#even_book {
  color: red;

}