html, body, index_body {
    user-select: none;
    background: white;
    overscroll-behavior-y: none;
}

.div_hide {
    width: 100%;
    height: 100%;
    background-color: #f0f0f0;
    display: none;
    justify-content: center;
    align-items: center;
}
.div_show {
    width: 98vw;
    height: 98vh;
    background-color: #f0f0f0;
    display: block;
    justify-content: center;
    align-items: center;
    border:1px solid lightblue;
}

.iframeclass {
    width: 100%;
    height:100%;
    border:0px solid red;
}