wikimedia/mediawiki-extensions-VisualEditor

.ve-ui-mwTwoPaneTransclusionDialogLayout {
    &-stackLayout {
        /* We don't want anything to collapse left/right, so shouldn't use margin */
        padding: 0 20px;

        /* Allow inputs to use the full width */
        .oo-ui-textInputWidget,
        .ve-ui-mwParameterPage-inlineDescription,
        .oo-ui-actionFieldLayout.oo-ui-fieldLayout-align-top {
            max-width: none;
        }
    }
}