body{margin:0;font-family:Arial,sans-serif;background:#bb70ec;display:flex;justify-content:center;align-items:center;height:100vh}.calculator{background:#3a3939;padding:25px;border-radius:17px;width:320px;color:#fff;text-align:center}input{width:100%;height:45px;font-size:18px;margin-bottom:8px;text-align:right;padding:5px;border-radius:6px;border:none}.result{height:30px;text-align:right;font-size:19px;margin-bottom:10px;color:#fff}.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}button{padding:12px;font-size:16px;border-radius:6px;border:none;cursor:pointer;background:#8c43df;color:#fff}button:hover{background:#8737d1}.equal{grid-column:span 2;background:#15ac4c;color:#000;font-weight:700}