body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  background: url('https://images.unsplash.com/photo-1508766206392-8bd5cf550d1b?auto=format&fit=crop&w=1920&q=80') no-repeat center center fixed;
  background-size: cover;
  color: white;
  text-shadow: 0 1px 3px rgba(0,0,0,0.8);
}
.overlay {
  background: rgba(0, 0, 0, 0.6);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
}
h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: 3rem;
  margin-bottom: 1rem;
}