body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f0f0f0;
  color: #333;
}

header {
  background-color: #007acc;
  color: white;
  padding: 1em;
  text-align: center;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
  font-weight: bold;
}

main {
  padding: 2em;
}

form {
  background-color: #fff;
  padding: 1em;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  max-width: 500px;
}

footer {
  background-color: #222;
  color: #aaa;
  text-align: center;
  padding: 1em;
  position: fixed;
  bottom: 0;
  width: 100%;
}