body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: #2d3436;
}

#display {
    background-color: #dfe6e9;
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #2d3436;
}

#display h2 {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}