html {
  font-family: Arial, sans-serif;
  background: #1E2124;
  color: #F4F4F4;
  min-height: 100%;
}

header {
  background: #2a2e33;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

header h1 {
  margin: 0;
}

.center {
  text-align: center;
  margin: auto;
}