internal-css.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      section {
        background-color: #4c3a51;

        text-align: center;
      }

      h1 {
        color: #fff;
      }

      h2 {
        color: #b25068;
      }
    </style>
  </head>
  <body>
    <main>
      <!--Internal CSS-->
      <section>
        <h1>Welcome to Movie App!</h1>
      </section>
      <section>
        <h2>How it works</h2>
      </section>
    </main>
  </body>
</html>