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HTML

<!DOCTYPE html>
<html lang="en">

  <head>
    <title> Portfolio </title>
    <link rel="stylesheet" text="text/css" href="css/main.css">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="My new portfolio!">
    <meta name="keywords" content="HTML, CSS, PORTFOLIO, WEB DESIGN, WEB DEV">
    <meta name="author" content="Fotan Fotan">
    <link href='https://fonts.googleapis.com/css?family=Didact+Gothic' rel='stylesheet' type='text/css'>

  </head>

  <body>

    <div id="wrapper">
      <header>
        <ul>
          <li><a href="index.html">Home</a></li>
          <li><a href="#">Projects</a></li>
          <li><a href="#">About</a></li>
          <li><a href="#">Contact</a></li>
        </ul>
      </header>

      <section>
        <div class="box">
          <p> bla bla </p>
        </div>
        <div class="box">

        </div>
      </section>
    </div>

  </body>

</html>

CSS

* {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Didact Gothic', sans-serif;
  background-image: url(../images/pink_rice.png);
}

#wrapper {
  width: 100%;
  max-width: 1366px;
  height: auto;
  margin: auto;
}


/**** Header ****/

header {
  width: 90%;
  height: 50px;
  margin: 0 auto;
  background-color: #36FF54;
  border: 5px solid #36FF54;
}

ul {
  width: 35%;
  padding: 15px;
  font-weight: 500;
  font-size: 1.1em;
}

li {
  display: inline;
  padding: 15px;
}

li a {
  text-decoration: none;
  color: #fff;
  padding: 10px;
}

li a:hover {
  background-color: #FFF;
  color: #111;
}

section {
	overflow: auto;
  width: 90%;
  height: auto;
  margin: 0 auto;
  background-color: #fff;
}

.box {
  width: 90%;
  height: 300px;
  margin: 2% auto;
  border: 5px solid #36FF54;
  background: #ffffff;
}