body {
  font-family: sans-serif;
  background: #f4f4f4;
  color: #111;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}
header {
  text-align: center;
}
header img {
  max-width: 150px;
  margin-bottom: 1rem;
}
.boton {
  display: inline-block;
  background: #111;
  color: white;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: 5px;
  margin-top: 1rem;
}
footer {
  margin-top: 4rem;
  font-size: 0.85rem;
  color: #555;
  text-align: center;
}