design-themes/theme_yes/views/snippets/s_carousel.xml

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

<template id="s_carousel" inherit_id="website.s_carousel">
    <!-- Slide 1 -->
    <xpath expr="(//*[hasclass('o_we_bg_filter')])" position="replace">
        <div class="o_we_bg_filter" style="background-color: rgba(25, 41, 37, 0.55) !important;"/>
    </xpath>
    <!-- Slide 2 -->
    <xpath expr="(//*[hasclass('container')])[2]" position="before">
        <div class="o_we_bg_filter" style="background-color: rgba(25, 41, 37, 0.55) !important;"/>
    </xpath>
    <xpath expr="//*[hasclass('carousel-item')][2]" position="attributes">
        <attribute name="class" add="o_cc o_cc5 pt152 pb152" remove="pt96 pb96" separator=" "/>
    </xpath>
    <!-- Slide 3 -->
    <xpath expr="(//*[hasclass('container')])[3]" position="before">
        <div class="o_we_bg_filter" style="background-color: rgba(25, 41, 37, 0.55) !important;"/>
    </xpath>
    <xpath expr="//*[hasclass('carousel-item')][3]" position="attributes">
        <attribute name="class" add="pt152 pb152" remove="pt128 pb128" separator=" "/>
    </xpath>
</template>

</odoo>