body {
  max-width: 800px;
  margin: 2em auto;
  font-family: 'Segoe UI', sans-serif;
  background-color: #f9f9f9;
  color: #333;
}

header {;
  background-color: #222;
  color: #fff;
  padding: 1.2em 0;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 1.8em;
}

nav {
  margin-top: 0.5em;
}

nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 15px;
  font-size: 1em;
}

nav a:hover {
  text-decoration: none;
}

main {
  max-width: 800px;
  margin: 2em auto;
  padding: 1.5em;
  background: #fff;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

h2 {
  margin-top: 0;
  color: #444;
}

ul {
  line-height: 1.8;
  padding-left: 1.2em;
}

footer {
      background: #333; color: #fff;
      text-align: center; padding: 1em;
    }
    footer a {
      color: #90caf9;
      margin: 0 10px;
      text-decoration: none;
    }

.plan {
  margin-bottom: 2em;
  padding: 1em;
  background: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 5px;
}

.plan h3 {
  margin-top: 0;
  color: #1976d2;
}

.paddle-btn {
  display: inline-block;
  background-color: #1976d2;
  color: white;
  padding: 0.5em 1em;
  border-radius: 5px;
  text-decoration: none;
  margin-top: 0.5em;
}

.paddle-btn:hover {
  background-color: #125ea7;
}

.note {
  background-color: #e3f2fd;
  border-left: 4px solid #1976d2;
  padding: 1em;
  margin-top: 2em;
  border-radius: 4px;
}