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

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

<template id="s_images_wall" inherit_id="website.s_images_wall">
    <!-- Section -->
    <xpath expr="//section" position="attributes">
        <attribute name="class" add="pt0 pb0 o_cc o_cc5 o_spc-none" remove="pt24 pb24 o_spc-small" separator=" "/>
    </xpath>
    <!-- Container -->
    <xpath expr="//div[hasclass('container')]" position="attributes">
        <attribute name="class" add="container-fluid" remove="container" separator=" "/>
    </xpath>
</template>

<template id="s_image_gallery" inherit_id="website.s_image_gallery">
    <!-- Section -->
    <xpath expr="//section" position="attributes">
        <attribute name="class" add="pt80 pb80" remove="pt24 pb24" separator=" "/>
    </xpath>
    <!-- Item #2 - Img -->
    <xpath expr="//div[hasclass('carousel-item')][2]/img" position="attributes">
        <attribute name="src">/web/image/website.library_image_16</attribute>
    </xpath>
    <!-- Item #2 - Indicator -->
    <xpath expr="//div[hasclass('carousel-indicators')]//button[3]" position="attributes">
        <attribute name="style">background-image: url(/web/image/website.library_image_16)</attribute>
    </xpath>
</template>

</odoo>