.calculator {
    display: flex;
    flex-direction: column;
    width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 2px solid #ccc;
    border-radius: 10px;
}

.display {
    width: 100%;
    height: 40px;
    margin-bottom: 10px;
    text-align: right;
    font-size: 24px;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.button {
    padding: 20px;
    font-size: 18px;
    background-color: #f0f0f0;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.button.operator {
    background-color: #f79c42;
    color: white;
}

.button:hover {
    background-color: #e0e0e0;
}

.button.operator:hover {
    background-color: #e67e22;
}