.calculator {
    max-width: 350px;
    width: 90%;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 10px;
    text-align: center;
    /*background-color: #f5f5f5;*/
    background-color: #111111c2;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

#display {
    width: 100%;
    margin-bottom: 15px;
    padding: 0px;
    font-size: 36px;
    text-align: right;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
}

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


.buttons .number{
    background-color: rgb(176, 179, 179);
}

.buttons .operator{
    background-color: #ffbf7f;
}

.buttons .function{
    background-color: #8ca6d3d7;
}

button {
    width: 68px;
    height: 80px;
    font-size: 28px;
    border: 1px solid #ccc;
    border-radius: 10px;
    background-color: #fff;
    color: #000;
    cursor: pointer;
    transition: background-color 0.3s;
}



button:hover {
    background-color: #ccc;
}

.integral-button, .derivative-button {
    background-color: #3498db;
    color: #fff;
}

.integral-button:hover, .derivative-button:hover {
    background-color: #2980b9;
}