Calculator.css

body {
    background-color: rgb(0, 0, 0);
}

table {
    border-collapse: collapse;
    background-color: rgb(50, 56, 57);
    margin: auto;
}

td {
    border-color: rgb(130, 180, 192);
    border-style: solid;
    border-width: 2px;
    height: 70px;
}

    td.cell-1x1, td.cell-2x1 {
        width: 60px;
    }

    td.cell-2x1 {
        height: 140px;
    }

input {
    width: 100%;
    height: 100%;
    padding: 0px;
    font-family: Consolas, Verdana, Arial, sans-serif;
    font-size: 2.4em;
    font-weight: bold;
    color: rgb(140, 244, 242);
    background-color: rgb(50, 56, 57);
    border-style: none;
}

    input[type=text] {
        text-align: right;
    }