root {
    /* Declared so no panel in this tree ever claims the OS pointer -- a hovered
       panel outranks Mouse.CursorType, and one that declares nothing still claims
       the default arrow. GameCursor draws the cursor instead. */
    cursor: none;
    position: absolute;
    pointer-events: none;
    width: 0;
    height: 0;
    overflow: visible;
}