body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #1e1e1e;
  color: #eeeeee;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  text-align: center;
}

h1 {
  font-size: 4em;
  margin: 0 0 20px 0;
}

p {
  font-size: 1em;
  margin: 0 0 10px 0;
}

#countdown {
  font-size: 0.8em;
}

@media (max-width: 600px) {
  h1 { font-size: 4em; }
  p { font-size: 1em; }
  #countdown { font-size: 0.8em; }
}