body {
  font-family: Verdana, sans-serif;
  background-color: #f2f2f2;
  color: #333;
  margin: 0;
  padding: 0;
}

header {
  background-color: #006699;
  color: white;
  padding: 10px;
  text-align: center;
}

.logo {
  font-size: 2em;
  font-weight: bold;
}

.logo span {
  color: #cceeff;
}

nav ul {
  list-style: none;
  padding: 0;
}

nav ul li {
  display: inline-block;
  margin: 0 10px;
}

nav ul li a {
  color: white;
  text-decoration: none;
}

main {
  padding: 20px;
}

.hero {
  background-color: #e1f1ff;
  padding: 20px;
  border-left: 4px solid #006699;
}

.promo img {
  width: 100%;
  max-width: 300px;
  filter: grayscale(100%) contrast(1.2);
  border: 1px dashed red;
}

footer {
  background-color: #ddd;
  text-align: center;
  padding: 10px;
  font-size: 0.9em;
}

.secreto {
  color: #999;
  cursor: pointer;
  margin-top: 10px;
}