design-themes/theme_loftspace/views/snippets/s_image_gallery.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

<template id="s_image_gallery" inherit_id="website.s_image_gallery">
    <!-- Container -->
    <xpath expr="//div[hasclass('o_container_small')]" position="attributes">
        <attribute name="class" add="container" remove="o_container_small" separator=" "/>
    </xpath>
</template>

<template id="s_images_wall" inherit_id="website.s_images_wall">
    <!-- Section -->
    <xpath expr="//section" position="attributes">
        <attribute name="class" add="pt96 pb96" remove="pt24 pb24" separator=" "/>
    </xpath>
</template>

</odoo>