I try to make this page item
<div class="mw-collapsible mw-collapsed" style="width: 530px; border-width: 1px; border-style: dashed; border-color: grey; color: grey;"><<title>>
<div class="mw-collapsible-content" style="color: var(--theme-page-text-color);"><<content>>
</div></div>
``var(--theme-page-text-color)`` works fine in Preview, but not on resulting page .