body {
  margin: 0;
  font-family: sans-serif;
  background: #111;
  color: #eee;
}
header, footer {
  text-align: center;
  padding: 1.5rem;
  background: #000;
}
.container {
  max-width: 800px;
  margin: auto;
  padding: 2rem 1rem;
}
.cta-button {
  display: block;
  margin: 1rem auto;
  padding: 1rem 2rem;
  background: #10b981;
  color: #000;
  border-radius: 8px;
  text-align: center;
  text-decoration: none;
  font-weight: bold;
}
ul {
  list-style: none;
  padding: 0;
}
li {
  padding: 0.5rem 0;
}
.feature {
  background: #1e1e1e;
  padding: 1rem;
  border-left: 4px solid #10b981;
  margin: 1rem 0;
}