* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: rgb(224, 219, 219);
}

/* Style the header */
header {
  background-color: #666;
  padding: 15px;
  text-align: center;
  font-size: 35px;
  color: white;
}

/* Create two columns/boxes that floats next to each other */
nav {
  float: left;
  width: 25%;
  background: #ccc;
  padding: 2px;
  margin:2px;
}

article {
  float: left;
  padding: 2px;
  width: 60%;
  background-color: #f1f1f1;
  margin:2px;
}

/* Clear floats after the columns */
section::after {
  content: "";
  display: table;
  clear: both;
  margin: 2px;
}

aside {
  padding: 2px;
  width: 15%;
  background-color: #f1f1f1;
}
/* Style the footer */
footer {
  background-color: #777;
  padding: 2px;
  text-align: center;
  color: white;
}

/* Responsive layout - makes the two columns/boxes stack on top of each other instead of next to each other, on small screens */
@media (max-width: 600px) {
  nav, article {
    width: 100%;
    height: auto;
  }
}