body {
  background-color: #0d0e12;
  font-family: Consolas, sans-serif;
}
main {
  width: 500px;
  background-color: #273135;
  padding: 1em;
}
h1 {
  font-size: 38px;
  color: hsl(0, 0%, 100%);
}
h2 {
  font-size: 26px;
  color: rgba(255, 255, 255, 0.7);
}
h3 {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.5);
}