body {
  background: #12458c;
  margin: 0rem;
  padding: 0px;
  font-family: -apple-system, BlinkMacSystemFont,
            "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell",
            "Fira Sans", "Droid Sans", "Helvetica Neue",
            sans-serif;
}

header {
  text-transform: uppercase;
  padding-top: 1px;
  padding-bottom: 1px;
  color: #fff;
  border-style: solid;
  border-width: 2px;
}

aside {
  color: #fff;
  border-width:2px;
  border-style: solid;
  float: left;
  width: 20%;
}

footer {
  color: #fff;
  border-width:2px;
  border-style: solid;
  clear: both;
}

main {
  float: right;
  width: calc(78%);
  padding: 5px;
}

main > article {
  background: hsl(240, 100%, 50%);
  color: hsl(240, 0%, 100%);
  border-width: 5px;
}