body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f2f5;
}

#app {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.page {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.page iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.hidden {
    display: none;
}