odoo16/addons/mail_plugin/views/mail_plugin_login.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="mail_plugin.app_auth" name="Accept app">
        <t t-call="web.login_layout">
            <t t-set="disable_database_manager" t-value="1"/>
            <form role="form" method="post" action="/mail_plugin/auth/confirm">
                <input type="hidden" name="csrf_token" t-att-value="request.csrf_token()"/>
                <input type="hidden" name="redirect" t-att-value="redirect"/>
                <input type="hidden" name="scope" t-att-value="scope"/>
                <input type="hidden" name="state" t-att-value="state"/>
                <input type="hidden" name="friendlyname" t-att-value="friendlyname"/>
                <p class="text-center">
                    Let <t t-esc="friendlyname" /> access your Odoo database?
                </p>
                <p class="text-center">
                    <button type="submit" name="do" value="1" class="btn btn-link btn-sm">Allow</button>
                    <button type="submit" name="do" class="btn btn-link btn-sm">Deny</button>
                </p>
            </form>
        </t>
    </template>
</odoo>