.masthead {
  background: #333;
}

.masthead h1 {
  margin: 0 0 1em;
  padding: 1em 0;
  font-size: 2em;
  font-weight: 300;
  text-align: center;
  color: #fff;
}

@media screen and (min-width: 50em) {
  .masthead h1 {
    font-size: 2.5em;
  }
}