.op3-element[data-op3-element-type="verticaltabscontent"] {
    // Stretch children container while dragging, allowing better user
    // experience: element can be dropped into verticaltabscontentitem
    // element.
    html.op3-draganddrop-dragging & .op3-element-verticaltabscontent__children {
        flex: 1;
    }
}