Use main theme’s CSS for the outer wrapper in list-category-posts?

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To format the overall list container use the class paramater:

class – CSS class for the default UL generated by the plugin.

Also, you can change the generated code to a div if you pass the parameter “div” to “template”:

[catlist  template=div class=mygallerytheme]

This will create something like:

<div class="mygallerytheme">
  <p>Post 1</p>
  <p>Post 2</p>
</div>

Other than that, to include a wrapper around the default ul, you should use the template system to wrap the [catlist] calls with a custom div.