OSPPCloudEnterprise3/addons/theme_odoo_experts/views/snippets/s_features_grid.xml

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

<template id="s_features_grid" inherit_id="website.s_features_grid">
    <!-- Item #1 - Icon -->
    <xpath expr="//i" position="attributes">
        <attribute name="class" add="rounded" remove="rounded-circle" separator=" "/>
    </xpath>
    <!-- Item #2 - Icon -->
    <xpath expr="(//i)[2]" position="attributes">
        <attribute name="class" add="rounded" remove="rounded-circle" separator=" "/>
    </xpath>
    <!-- Item #3 - Icon -->
    <xpath expr="(//i)[3]" position="attributes">
        <attribute name="class" add="rounded" remove="rounded-circle" separator=" "/>
    </xpath>
</template>

</odoo>