body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
}
header {
  background: #222;
  color: #fff;
  padding: 1rem;
  text-align: center;
}
nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}
nav a {
  margin: 0.5rem;
  color: #ccc;
  text-decoration: none;
}
main {
  padding: 1rem;
}
section {
  margin-bottom: 2rem;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1rem 0;
}
footer {
  background: #222;
  color: #fff;
  text-align: center;
  padding: 1rem;
}
@media (min-width: 600px) {
  nav {
    gap: 2rem;
  }
  img {
    margin: 1rem auto;
  }
}