.sandbox-controls{background:#222;padding:15px;border-radius:5px;color:#fff}.sandbox-controls h3{margin-top:0}.control-group{margin-bottom:10px}.control-group label{display:inline-block;width:150px}.control-group select{background:#333;color:#fff;border:1px solid #555;padding:5px}.control-group button{background:#4caf50;color:#fff;border:none;padding:8px 15px;cursor:pointer;border-radius:3px}.control-group button:hover{background:#45a049}.control-group button:disabled{background:#666;cursor:not-allowed}