.calculator{display:flex;justify-content:center;align-items:center;min-height:100vh}.calculator__body{display:flex;flex-direction:column;align-items:center;background-color:#f5f5f5;padding:20px;border-radius:10px;box-shadow:0 4px 8px #0000001a;width:280px}.calculator__display{display:flex;flex-direction:column;box-sizing:border-box;border:1px solid black;border-radius:8px;width:90%;font-size:24px;padding:5px}.calculator__expression,.calculator__result{box-sizing:border-box;height:40px;text-align:right;font-size:20px;font-family:Courier New,Monaco,Consolas,monospace;font-weight:700;letter-spacing:1px;padding:5px;overflow:hidden}.calculator__expression{color:#9a9696;font-size:16px}.calculator__buttons{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:50px;gap:10px;width:250px;margin-top:20px}.calculator__buttons button{background-color:#e0e0e0;border:none;border-radius:5px;font-size:24px;color:#333;cursor:pointer;transition:background-color .3s ease}#clear{grid-column:span 2;background-color:#b3b3b3;color:#fff}#zero{grid-column:span 2}#equals{grid-row-start:4;grid-row-end:6;grid-column-start:4;background-color:#f70202;border:none;color:#fff}