body{background-color:#f2f2f2;color:#333}form{width:80%;margin:0 auto;padding:20px}input[type=number]{width:100%;padding:12px 20px;margin:8px 0;box-sizing:border-box;border:2px solid #ccc;border-radius:4px}select{width:100%;padding:12px 20px;margin:8px 0;box-sizing:border-box;border:2px solid #ccc;border-radius:4px;background-color:#f9f9f9}input[type=button]{width:100%;background-color:#4caf50;color:#fff;padding:14px 20px;margin:8px 0;border:none;border-radius:4px;cursor:pointer}form{padding:10px}input[type=number]{padding:5px;margin:5px}input[type=button]{padding:5px;margin:5px}select{padding:5px;margin:5px}#result{background-color:#f2f2f2;padding:10px;margin-bottom:10px}