html, body {
    height: 100%;
    margin: 0;
}

#container {
    display: flex;
    height: 100vh;
}

#left {
    overflow: hidden;
    display: flex;
    flex: 0 0 50%;
}

#right {
    overflow: hidden;
    display: flex;
    flex: 1;
}

#divider {
    width: 6px;
    cursor: col-resize;
    background: #ccc;
}

#drag-overlay {
    position: fixed;
    inset: 0;
    cursor: col-resize;
    display: none;
    z-index: 9999;
}

#left iframe,
#right iframe {
    width: 100%;
    height: 100%;
    display: block;
    border: none;
}