body {
  font-family: sans-serif;
  background: #121212;
  color: #fff;
  margin: 0;
  padding: 0;
  text-align: center;
}
header {
  padding: 20px;
}
.logo {
  max-width: 180px;
}
main {
  padding: 20px;
}
.producto {
  background: #1e1e1e;
  border-radius: 10px;
  margin: 20px auto;
  padding: 20px;
  width: 80%;
}
.boton {
  display: inline-block;
  background: orange;
  padding: 10px 20px;
  color: #000;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
}
.promo {
  margin-top: 30px;
}
.autor-foto {
  max-width: 180px;
  border-radius: 100%;
  margin-top: 20px;
}
footer {
  background: #111;
  padding: 10px;
  font-size: 0.9em;
}
footer a {
  color: orange;
  text-decoration: none;
}