body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  background-color: black;
  color: white;
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  overflow: hidden;
}

.closed-screen {
  padding: 20px;
  position: relative;
}

h1 {
  font-size: 5rem;
  margin-bottom: 20px;
}

.subtitle {
  font-size: 1rem;
  color: #888;
}