odoo_theme/theme_bookstore/views/snippets/s_title.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="s_title" inherit_id="website.s_title">
        <!-- Section -->
        <xpath expr="//section" position="attributes">
            <attribute name="class" add="pt64 pb64 o_half_screen_height parallax s_parallax_is_fixed bg-black-50" remove="pt32 pb32" separator=" "/>
            <attribute name="data-scroll-background-ratio">1</attribute>
        </xpath>
        <xpath expr="//div[hasclass('container')]" position="before">
            <span class="s_parallax_bg oe_img_bg" style="background-image: url('/web/image/website.s_banner_default_image'); background-position: 50% 50%;"></span>
            <div class="o_we_bg_filter bg-black-50"/>
        </xpath>
        <!-- Title -->
        <xpath expr="//h1" position="replace">
            <h1 style="text-align: center;">
                <font style="font-size: 62px;"><b>Reading means borrowing.</b></font>
            </h1>
        </xpath>
    </template>
</odoo>