XF 1.4 How to always show signatures of certain usergroups?

Stuart Wright

Well-known member
So I want our advertiser user groups to always have their signatures shown, even on mobile.
(On the narrowest screen size, there is
    .Responsive .message .signature
        display: none;
So I thought I'd try to edit the message template to have
    <div class="baseHtml signature messageText ugc{xen:if $message.isIgnored, ' ignored'}" <xen:if is="{xen:helper ismemberof, $visitor, 10,13,16}"> style="display: block !important;"</xen:if>><aside>{xen:raw $message.signatureHtml}</aside></div>
but the extra HTML is not appearing. What am I doing wrong, please?
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