body {
  margin: 0;
  height: 100vh;

  background-image: url("background.gif");
  background-repeat: repeat;      
  background-position: top left;  

  font-family: Arial, sans-serif;
}

.overlay {
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  color: white;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

h1 {
  font-size: 3rem;
  margin: 0;
}

p {
  font-size: 1.2rem;
}