html, body {
    margin: 0;
    padding: 0;
}

.wrap{
    display: grid;
    grid-template-columns: 1fr 340px;
    grid-template-rows: 1fr;
    gap: 0 0;
    grid-template-areas:
    ". .";
}

.stream {
    display: block;       /* iframes are inline by default */
    border: none;         /* Reset default border */
    width: 100%;
    height: 100vh;        /* Viewport-relative units */
}

.chat {
    display: block;
    border: none;
    width: 340px;
    height: 100vh;
}


.wrap-vertical {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 0 0;
    grid-template-areas:
    "."
    ".";
}

.wrap-vertical .stream {
    height: 50vh;
}

.wrap-vertical .chat {
    width: 100%;
    height: 50vh;
}