switch/addons/blog/view/default/category.html

{layout name="common/layout" /}

<div class="px-3 mb-3 bg-white">
    <h2 style="font-size:16px;margin:0;height:40px;line-height:40px;">{$category.name|htmlentities}</h2>
</div>

{include file="common/postlist"}