body {
  background-color: #121212;
  color: #e0e0e0;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header, footer {
  background-color: #1f1f1f;
  padding: 20px;
  text-align: center;
}
nav a {
  color: #90caf9;
  margin: 0 15px;
  text-decoration: none;
}
.container {
  padding: 20px;
}
input, textarea {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  background-color: #2c2c2c;
  color: #fff;
  border: 1px solid #555;
}
input[type=submit] {
  background-color: #1976d2;
  border: none;
  color: white;
  cursor: pointer;
}