.rps-calculator{width:300px;padding:20px;border:1px solid #ccc}.rps-calculator label{display:block;margin-bottom:5px}.rps-calculator input,.rps-calculator button{width:100%;padding:8px;margin-bottom:10px;box-sizing:border-box}#modifier{background-color:#e0e0e0;color:#333}#result{font-weight:700;margin-top:10px}