* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Times New Roman", Times, serif;
}

#wrapper {
  width: 100%;
}

.header {
  background-color: #666;
  height: 60px;
  line-height: 60px;
  text-align: center;
  font-size: 35px;
  color: white;
}

.navigation {
  width: 30%;
  height: 300px;
  background-color: #f1f1f1;
  float: left;
  padding: 20px;
}

.article {
  width: 70%;
  height: 300px;
  background-color: #ffffff;
  float: left;
  padding: 20px;
  border-left: 1px solid #ddd;
}

.footer {
  clear: both;
  background-color: #666;
  color: white;
  text-align: center;
  padding: 20px;
  font-size: 20px;
}