galicea-odoo-addons-ecosystem/galicea_openid_connect/views/templates.xml

<odoo>
  <data>
    <template id="error" name="OpenID/OAuth user-visible error">
      <t t-call="web.layout">
        <t t-set="head">
            <t t-call-assets="web.assets_common" t-js="false"/>
            <t t-call-assets="web.assets_frontend" t-js="false"/>
            <t t-call-assets="web.assets_common" t-css="false"/>
            <t t-call-assets="web.assets_frontend" t-css="false"/>
        </t>
        <t t-set="body_classname" t-value="'container'"/>

        <div class="row">
          <div class="panel panel-danger">
            <div class="panel-heading">OpenID Client is misconfigured</div>
            <div class="panel-body">
              <b><t t-esc="exception.type"/>: </b><t t-esc="exception.message"/>
            </div>
          </div>
        </div>
      </t>
    </template>
  </data>
</odoo>