body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
    font-family: Arial, sans-serif;
}

.calculator {
    border: 1px solid #ccc;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    width: 300px;
}

.display {
    background-color: #222;
    color: #fff;
    font-size: 2.5em;
    padding: 20px;
    text-align: right;
    overflow: hidden;
    white-space: nowrap;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background-color: #ccc;
}

.button {
    background-color: #eee;
    border: none;
    padding: 20px;
    font-size: 1.5em;
    cursor: pointer;
    transition: background-color 0.2s;
}

.button:hover {
    background-color: #ddd;
}

.button.operator {
    background-color: #f7923b;
    color: #fff;
}

.button.operator:hover {
    background-color: #e6812a;
}

.button.clear {
    background-color: #d3d3d3;
}

.button.clear:hover {
    background-color: #c0c0c0;
}

.button.equal {
    background-color: #4CAF50;
    color: #fff;
    grid-column: span 2;
}

.button.equal:hover {
    background-color: #45a049;
}

.button.zero {
    grid-column: span 2;
}