html, body {
    border: 0px;
    margin: 0px;
    padding: 0px;
}

.mainframe {
    position:absolute;
    width: 100%;
    height: 100%;
    border: 0px;
    margin: 0px;
    padding: 0px;
    display: block;
}

.contentframe {
    display: flex;
    width:100%;
    height:100%;
    border: 0px;
    margin: 0px;
    padding: 0px;
}

.hiddenframe {
    display: none;
    width: 0px;
    height: 0px;
    border: 0px;
    margin: 0px;
    padding: 0px;
}