.mean-calculator{max-width:400px;background:#fff;padding:20px;border-radius:10px;box-shadow:0 4px 15px rgb(0 0 0 / .1);font-family:Arial,sans-serif}.mean-calculator h3{margin-bottom:10px;color:#222}.mean-calculator textarea{width:100%;height:80px;padding:10px;border-radius:6px;border:1px solid #ccc;resize:none}.mean-calculator button{margin-top:10px;width:100%;padding:10px;background:#0073aa;color:#fff;border:none;border-radius:6px;cursor:pointer}.mean-calculator button:hover{background:#005f8d}.mean-result{margin-top:12px;font-size:16px;color:#000}