index.scss

.iframe {
    border: 0;
    height: 100%;
    margin: 0;
    padding: 0;
    width: 100%;
}

.iframe-box {
    align-items: center;
    display: flex;
    height: calc(100vh - 100px);
    justify-content: center;
    overflow: auto;
    width: 100%;
}

.iframe-loading {
    left: 50%;
    position: fixed;
    top: 50%;
}