iframe {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    z-index: 999999;
}

h1 {
    font-size: 0em;
}

*:fullscreen,
*:-webkit-full-screen,
*:-moz-full-screen {
    background-color: rgba(255, 255, 255, 0) !important;
    padding: 20px;
}

::backdrop {
    background-color: white;

}