#odc-calculator{max-width:450px;margin:20px auto;padding:25px;border:3px solid #4caf50;border-radius:10px;background:#f1f8e9;box-shadow:0 0 15px rgba(0,0,0,.2)}#odc-calculator h2{text-align:center;color:#4caf50;margin-bottom:20px}#odc-calculator form{display:flex;flex-direction:column}#odc-calculator label{margin:10px 0 5px;color:#333;font-weight:700}#odc-calculator input,#odc-calculator select,#odc-calculator button{padding:10px;margin-bottom:10px;border-radius:5px;border:1px solid #ccc;font-size:14px}#odc-calculator button{background:#4caf50;color:#fff;border:none;cursor:pointer;font-size:16px}#odc-calculator button:hover{background:#388e3c}#result{margin-top:20px;text-align:center;font-weight:700;color:#388e3c}