body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: #fefefe;
  text-align: center;
  height: 100vh;
  overflow: hidden;
}

h1 {
  margin-top: 50px;
  font-size: 3rem;
}

p {
  font-size: 1.5rem;
}

#startBtn {
  padding: 1rem 2rem;
  font-size: 1.2rem;
  background-color: black;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  z-index: 2;
}