/* CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,
body {
    height: 100%;
    width: 100%;
}
body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f8f9fa;
    color: #222;
    min-height: 100vh;
    min-width: 100vw;
    display: flex;
    flex-direction: column;
}
iframe {
    flex: 1 1 0;
    width: 100vw;
    height: 100vh;
    border: none;
    display: block;
}
@media (max-width: 600px) {
    body {
        font-size: 16px;
    }
    iframe {
        width: 100vw;
        height: 100vh;
    }
}