body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f4;
}

header {
  background: #111;
  color: white;
  text-align: center;
  padding: 15px;
}

nav {
  background: #222;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

nav a {
  color: white;
  padding: 10px;
  text-decoration: none;
}

nav a:hover {
  background: #00bfff;
}

.container {
  padding: 20px;
  max-width: 1000px;
  margin: auto;
}

.button {
  display: inline-block;
  padding: 12px 20px;
  margin: 10px 0;
  background: #00bfff;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

.gallery img {
  width: 100%;
  max-width: 300px;
  margin: 10px;
  border-radius: 10px;
}

@media (max-width: 600px) {
  nav {
    flex-direction: column;
  }
}