.container{width:800px;margin:20px auto;display:flex;flex-direction:column;justify-content:center;align-items:center}.calculator-container{border:1px solid black;width:350px;padding:10px;border-radius:12px}.display{height:32px;border:1px solid black;border-radius:4px;margin-bottom:10px;padding:4px}.keypad{display:grid;grid-template-columns:repeat(4,auto);grid-gap:10px;gap:10px}.key{border-radius:50%;background-color:gray;width:25px;height:25px;display:flex;justify-content:center;align-items:center;cursor:pointer;padding:5px}.operation{background-color:orange}