body {
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

.container {
  max-width: 800px;
  overflow: hidden;
  margin: 50px auto;
}

header,
section,
aside,
footer {
  border: 2px solid grey;
  border-radius: 5px;
  text-align: center;
}

header {
  height: 5em;
  line-height: 5em;
  margin-bottom: 1em;
}

section {
  float: left;
  width: 60%;
  margin-right: 5%;
  height: 400px;
  margin-bottom: 1em;
  padding-top: 3em;
}

aside {
  float: right;
  width: 35%;
  height: 300px;
  padding-top: 3em;
}

footer {
  clear: both;
  font-weight: bold;
  background-color: #eee;
  padding: 2em 0;
}