body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f0f0f;
  color: white;
}

header {
  display: flex;
  justify-content: space-between;
  padding: 20px;
  background: black;
}

nav a {
  color: white;
  margin-left: 15px;
  text-decoration: none;
}

.hero {
  text-align: center;
  padding: 100px 20px;
}

.btn {
  background: red;
  padding: 10px 20px;
  color: white;
  text-decoration: none;
}

.card {
  background: #1a1a1a;
  padding: 20px;
  margin: 20px 0;
}