social/mail_inline_css/demo/demo_mail_template.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo noupdate="0">
    <record id="email_template_demo" model="mail.template">
        <field name="name">Inline styles demo</field>
        <field name="body_type">qweb</field>
        <field name="body_view_id" ref="demo_email_hello" />
        <field name="model_id" ref="base.model_res_users" />
        <field name="subject">Demo email inline styles</field>
    </record>
</odoo>