body {
  font-family: Arial, sans-serif;
  background-color: #f4f6fa;
  color: #333;
  padding: 20px;
}
header {
  background-color: #1a1a2e;
  color: #fff;
  padding: 15px;
}
header h1 {
  margin: 0;
}
nav a {
  margin-right: 15px;
  color: #fff;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
h1 {
  color: #1a1a2e;
}
textarea {
  width: 100%;
  margin-top: 10px;
}