* {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
         box-sizeing: border-box;
}

body {
  background: #f5f5f5;
  width: 960px;
  margin: 20px auto;
}

header {
  background-image: url(http://intro-webdesign.com/CSS/assignment-2/images/flywheel.jpg);
  padding: 10px;
}

h1 {
  text-align: center;
  text-transform: uppercase;
  color: #fff;
}

nav {
  margin: 30px;
}

nav a {
  background-color: rgba(255, 255, 255, 0.3);
  text-decoration: none;
  text-align: center;
  color: #000;
  margin: 20px;
  padding: 10px 50px;
  border-radius: 5px;
}

.active {
  background-color: #fff;
}

main {
  margin-top: -20px;
}

.left {
  background-color: #33691E;
  width: 200px;
  height: 100vh;
  display: block;
  float: left;
}

img {
  margin: 20px 20px 0px 20px;
  width: 160px;
  height: 100px;
  border: 2px solid #000;
}

.right {
  padding-left: 205px;
}

h2 {
  padding-top: 20px;
}