body { background-image: linear-gradient(to right, #3498db, #f1c40f); } .container { max-width: 1200px; margin: 40px auto; padding: 20px; background-color: #2c3e50; border-radius: 10px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.5); } .collaboration-section { background-color: #4c5154; padding: 20px; border-radius: 10px; } .invite-code { font-size: 24px; font-weight: bold; margin-bottom: 20px; color: #ecf0f1; }