html {
  margin: 0;
  padding: 0;
}
body {
  margin: 2em;
  padding: 2em;
  font-family: Arial, Verdana, sans-serif;
  font-size: 16px;
  color: #f00;
  background-color: #200;
  border: 1px solid #F00;
}
h1 {
  margin: 2em 0;
  text-align: center;
}