html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}


body {
    background-color: #2196F3;
}

@media all and (display-mode: standalone) {
    html, body, div {
        -webkit-touch-callout: none;
        -webkit-user-select: none;
        -khtml-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
    }
}