body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  background: #f4f4f4;
  color: #333;
}
header {
  background: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}
header nav a {
  color: #fff;
  margin: 0 15px;
  text-decoration: none;
}
header nav a:hover {
  text-decoration: underline;
}
main {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
form input, form textarea {
  width: 100%;
  padding: 10px;
  margin: 5px 0;
  border-radius: 5px;
  border: 1px solid #ccc;
}
form input[type="submit"] {
  width: auto;
  background: #4CAF50;
  color: #fff;
  cursor: pointer;
}
form input[type="submit"]:hover {
  background: #45a049;
}
footer {
  text-align: center;
  padding: 20px;
  background: #eee;
  margin-top: 40px;
}