body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f5f7fa;
  color: #333;
}

header {
  background: #20232a;
  color: white;
  padding: 1rem;
}

nav a {
  color: #61dafb;
  margin-right: 1rem;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2rem;
}

footer {
  background: #20232a;
  color: #bbb;
  text-align: center;
  padding: 1rem;
}

button {
  background: #61dafb;
  color: #20232a;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 6px;
}

button:hover {
  background: #21a1f1;
}

.center {
  text-align: center;
  margin-top: 10%;
}