body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8f8f8;
  color: #333;
}
header, footer {
  background: #20232a;
  color: white;
  padding: 1em;
  text-align: center;
}
nav a {
  margin: 0 10px;
  color: #61dafb;
  text-decoration: none;
}
.hero {
  text-align: center;
  padding: 50px 20px;
  background: #e3f2fd;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  background: #1976d2;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
.container {
  max-width: 800px;
  margin: auto;
}
form input {
  padding: 10px;
  width: 220px;
  margin-right: 10px;
}
form button {
  padding: 10px 20px;
  background: #1976d2;
  color: #fff;
  border: none;
  border-radius: 4px;
}