body {
  font-family: 'Arial', sans-serif;
  background-color: #f4f6f8;
  color: #1a1a1a;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  padding: 30px 20px;
  background-color: #1f2937;
  color: #fff;
}

header img {
  max-width: 150px;
  margin-bottom: 10px;
}

nav {
  text-align: center;
  margin: 20px 0;
}

nav a {
  text-decoration: none;
  margin: 0 15px;
  font-weight: bold;
  color: #1f2937;
  transition: color 0.3s;
}

nav a:hover {
  color: #3b82f6;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
}

button {
  background-color: #3b82f6;
  color: #fff;
  padding: 12px 24px;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #2563eb;
}