body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f2f2f2;
    font-family: Arial;
}

.calculator {
    background: #222;
    padding: 25px;
    border-radius: 10px;
    width: 291px;
    height: 460px;
}

#display {
    width: 270px;
    height: 40px;
    font-size: 28px;
    margin-bottom: 10px;
    text-align: right;
    padding: 10px;
    align-items: center;
    color: black;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 60px);
    gap: 10px 15px;
    align-items: center;
    
}

button {
    width: 69px;
    height: 69px;
    font-size: 24px;
    cursor: pointer;
}

.dell {
    background: #ff0000;
    color: white;
}

.operator {
    background: blue;
    color: white;
}

.bracket {
    background: green;
    color: white;
}