web/web_environment_ribbon/view/base_view.xml

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

    <!-- Load css for ribbons -->
    <template id="assets_backend" name="ribbon_test assets" inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <link rel="stylesheet" href="/web_environment_ribbon/static/src/css/ribbon.css"/>
        </xpath>
    </template>

    <!-- Add ribbon to page -->
    <template id="body_with_ribbon_test" name="ribbon_test web.webclient_bootstrap" inherit_id="web.webclient_bootstrap">
        <xpath expr="//div[@class='openerp openerp_webclient_container']" position="before">
            <div class="test-ribbon"><b>TEST</b></div>
        </xpath>
    </template>


</data>
</openerp>