/* header {
  background: #111;
  color: #fff;
  padding: 15px 0;
}

header a {
  color: white;
  margin-right: 15px;
}

.btn-buy {
  display: inline-block;
  background: #ff6600;
  color: white;
  padding: 12px 18px;
  margin-top: 15px;
  border-radius: 5px;
}

article {
  background: white;
  padding: 15px;
  margin: 15px 0;
  border-radius: 8px;
} */