header { background-color: rgba(0, 0, 0, 0.5); padding: 20px; } header h1 { font-size: 2.5rem; } main { padding: 20px; } section { margin: 20px 0; padding: 15px; background-color: rgba(255, 255, 255, 0.1); border-radius: 10px; } button { padding: 10px 20px; margin-top: 10px; font-size: 1rem; background-color: #ffcc00; border: none; border-radius: 5px; cursor: pointer; color: #000; } button:hover { background-color: #ffdd33; } footer { margin-top: 20px; padding: 10px; background-color: rgba(0, 0, 0, 0.5); }