design-themes/theme_treehouse/views/snippets/s_banner.xml

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

<template id="s_banner" inherit_id="website.s_banner">
    <!-- Section -->
    <xpath expr="//section" position="attributes">
        <attribute name="class" add="o_cc o_cc3" separator=" "/>
        <attribute name="data-oe-shape-data">{"shape":"web_editor/Floats/12"}</attribute>
    </xpath>
    <!-- Shape -->
    <xpath expr="//*[hasclass('container')]" position="before">
        <div class="o_we_shape o_web_editor_Floats_12"/>
    </xpath>
    <!-- Title -->
    <xpath expr="//h1" position="replace" mode="inner">
        Hello Planet.
    </xpath>
</template>

</odoo>