/* https://open-web-calendar.hosted.quelltext.eu/ */
.calendar
{
    background:url('https://raw.githubusercontent.com/niccokunzmann/open-web-calendar/master/static/img/loaders/circular-loader.gif') center center no-repeat;
    margin: 0px;
    border: 0px;
    padding: 0px;
    width: 100%;
    min-height: 70vh;
    max-height: 100vh;
}