I want to add a new class inside column main div. Right now my layout in frontend is like this:
<div class="columns">
<div class="column main">
<div="MYDIV">
</div>
</div>
<div class="sidebar sidebar-additional">
</div>
</div>
this is my layout:
<layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_layout.xsd">
<update handle="1column"/>
<referenceContainer name="columns">
<container name="div.sidebar.main" htmlTag="div" htmlClass="sidebar sidebar-main" after="main">
<container name="sidebar.main" as="sidebar_main" label="Sidebar Main"/>
</container>
<container name="div.sidebar.additional" htmlTag="div" htmlClass="sidebar sidebar-additional" after="div.sidebar.main">
<container name="sidebar.additional" as="sidebar_additional" label="Sidebar Additional"/>
</container>
</referenceContainer>
</layout>