html, body {
    width:100%;
    height: 100%;
}

body {
    background-color: #cdcdcd;
    margin: 0;
    padding: 0;
}

main {
    display: flex;
    flex-direction: row;
    height: 100%;
}

main > .screen {
    flex: 1;
}
main > .betslip {
    width: 320px;
}