Help with header

https://www.reddit.com/r/simpleWebDevQuestions/comments/71uzsx/help_with_header/

by andersevenrud

HTML

<div class="header">
  <div class="linha">
    <header>
      <div class="coluna col4">
        <h1 class="logo">Logo</h1> </div>
      <div class="coluna col8">
        <nav>
          <ul>
            <li>MENU</li>
            <li>MENU</li>
            <li>MENU</li>
            <li>MENU</li>
          </ul>
        </nav>
      </div>
    </header>
  </div>
</div>

CSS

header {
  background: green;
}