header {
  background-color: lightgreen;
  border: 10px solid blue;
}
section {
  border: 10px solid red;
  background-color: lightgreen;
}
body {
  font-family: sans-serif;
  border: 5px solid yellow;
  background-color: green;
}
h3 {
color: black;
}
h2 {
  color: black;
}
footer {
  border: 10px solid grey;
  background-color: lightgreen;
}