body {
  background-color: #353535;
  color: white;
  font-family: sans;
}

#header {
  width: 70%;
  text-align: center;
  margin: 1em auto;
}

#content {
  width: 70%;
  text-align: center;
  margin: 1em auto;
  background-color: teal;
  padding:4em;
  border-radius: 1em;
}