/* Header */
header {
  background-color: blue;
  color: white;
  text-align: center;
  padding: 5px;
}

/* Navigation */
nav {
  background-color: yellow;
  padding: 7px;
}

/* Section + Articles */
section {
  padding: 15px;
  margin: 10px 10px 10px 10px;
  width: 300px;
  float: left;
}

/* Aside */
aside {
  background-color: blue;
  color: yellow;
  padding: 15px;
  margin: 10px 0 10px 350px;
}

/* Footer */
footer {
  background-color: red;
  color: white;
  clear: both;
  text-align: center;
  padding: 5px;
}

/* Jell-O layout wrapper */
#allcontent {
  width: 840px;
  margin-left: auto;
  margin-right: auto;
}

/* (Optional) Minor text tweaks */
body { font-family: Arial, Helvetica, sans-serif; line-height: 1.5; }
h1, h2, h3, h4 { margin: 0.4em 0; }
figure { margin: 0; }