@baris
Managed to find the following line
<div class="<!-- IF categories.class -->{categories.class}<!-- ELSE -->col-md-3 col-sm-6 col-xs-12<!-- ENDIF categories.class --> category-item" data-cid="{categories.cid}" data-numRecentReplies="{categories.numRecentReplies}">
in
./node_modules/nodebb-theme-lavender/templates/home.tpl
So I proceed to change it to
<div class="<!-- IF categories.class -->{categories.class}<!-- ELSE -->col-md-3 col-sm-6 col-xs-12<!-- ENDIF categories.class --> category-item category-class-{categories.cid}" data-cid="{categories.cid}" data-numRecentReplies="{categories.numRecentReplies}">
?