body{
    background-color: #88CDEA;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.mainDiv {
    width: 300px;
    height: auto;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);

    .firstWrapper {
        background-color: black;
        /* height: 50%; */
        border-radius: 8px 8px 0 0;
    }

    .secondWrapper {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: repeat(5, 1fr);
        gap: 5px;
        padding: 10px;


        .btn {
            color: #000;
            padding: 20px;
            text-align: center;
            font-size: 20px;
            font-weight: bolder;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            cursor: pointer;
        }

        .gray {
            background-color: #A9A9A9;
        }

        .green {
            background-color: #06ad06;
        }

        .ash {
            background-color: #D3D3D3;
        }

        .red {
            background-color: #e94427;
        }

        .equal {
            grid-column: 4 ;
            grid-row: span 4;
            display: flex;
            align-items: center;
            justify-content: center;
        }
    }

    #display {
        color: #ffffff;
        font-size: 30px;
        font-weight: bold;
        text-align: right;
        padding: 20px;
        overflow-x: auto;
    }

}