.percentage-calculator{max-width:500px;margin:20px auto;padding:20px;background-color:#f5f5f5;border-radius:8px;box-shadow:0 2px 4px rgb(0 0 0 / .1)}.calc-select{width:100%;padding:10px;margin-bottom:20px;border:1px solid #ddd;border-radius:4px;background-color:#fff;font-size:16px}.input-group{margin-bottom:15px}.input-group label{display:block;margin-bottom:5px;font-weight:700}.input-group input{width:100%;padding:10px;border:1px solid #ddd;border-radius:4px;font-size:16px}.calc-button{width:100%;padding:12px;background-color:#4CAF50;color:#fff;border:none;border-radius:4px;font-size:16px;font-weight:700;cursor:pointer;transition:background-color 0.3s}.calc-button:hover{background-color:#45a049}.result-area{margin-top:20px;padding:15px;background-color:#fff;border-radius:4px;border:1px solid #ddd;min-height:50px;font-size:16px;text-align:center}