body {
  padding: 20px;

  @media screen and (max-width: 400px) {
    padding: 3px;
  }
}

footer {
  border-top: 1px solid rgba(0, 0, 0, 0.2);
  padding-top: 10px;
  text-align: center;
  font-size: small;
  margin-top: 30px;
}