body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #fff;
  color: #333;
}

header {
  background: #222;
  text-align: center;
  padding: 10px;
}

.logo {
  max-width: 150px;
  margin: 10px auto;
  display: block;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 10px 0 0 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

nav li {
  margin: 5px 10px;
}

nav a {
  text-decoration: none;
  color: #fff;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

main {
  text-align: center;
  padding: 20px;
}

.main-image {
  max-width: 90%;
  height: auto;
  margin: 0 auto;
  display: block;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}