hi, how can add a custom background for my qweb template?

i have that but show me empty, in this case, i only want to set background in the second page

<template id="report_template_xxx">
            <t t-call="web.html_container">
                <t t-foreach="docs" t-as="o">
                    <meta charset="UTF-8" />
                    <div class="page" t-attf-class="article o_report_layout_standard o_company_#{o.company.id}_layout {{  'o_report_layout_background' if o.company.layout_background in ['Geometric', 'Custom']  else  '' }}"  t-att-data-oe-model="o and o._name" t-att-data-oe-id="o and o.id" t-att-data-oe-lang="o and o.env.context.get('lang')">
                        <span>background</span>
                    </div>
                    <div class="page" st-att-style="'background-image: url(/xxxx/static/img/Imagen1.png); background-size: cover; background-repeat: no-repeat; background-position: center; page-break-before: always;'">
                        <span>background 2</span>
                    </div>
                </t>
            </t>
        </template>