odoo_theme/theme_treehouse/views/snippets/s_image_text.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="s_image_text" inherit_id="website.s_image_text">
        <!-- Section -->
        <xpath expr="//section" position="attributes">
            <attribute name="class" add="pt64 pb64 bg-200" remove="pt32 pb32" separator=" "/>
        </xpath>
        <!-- Image -->
        <xpath expr="//img" position="attributes">
            <attribute name="class" add="p-3 img-thumbnail" separator=" "/>
        </xpath>
    </template>
</odoo>