why there is a black background in my QWeb report

I have write a report for my model odoo; but when I print my model, I find that all field has an black background, I don't know why, please give me an advice :

report file XML
<?xml version="1.0" encoding="UTF-8" ?>
<!--<?xml-stylesheet type="text/css" href="view.css"?>-->
<openerp>
    <data>
        <report
            id="action_report_omega"
            model="omega.model"
            string="Report"
            report_type="qweb-pdf"
            file="model_x.report_omega_document"
            name="model_x.report_omega_document"
        />
    </data>
</openerp>

and that is my template view :

<?xml version="1.0" encoding="UTF-8" ?>
<openerp>
    <data>
        <template id="report_omega_document">
            <t t-call="report.html_container">
            <t t-call="report.external_layout">
                <div class="page"  style="page-break-after: always;">
                    <div class="header">
                        <div class="row">
                            <div class="col-xs-3">
                                <img t-if="res_company.logo" t-att-src="'data:image/png;base64,%s' %res_company.logo"/>
                            </div>
                        </div>
                        <hr/>
                    </div>
                    <div class="body">
                        <h2 style="text-align: center; line-height: 2;">ORDER DE MISSION</h2>
                        <div>
                            <table style="border: 1px solid black; width: 100%;">
                                <tr style="padding: 3px;">
                                    <td style="padding: 5px 5px 5px 5px; border: 1px solid black; width: 30%;"><strong>Référence</strong></td>
                                    <td style="padding: 5px 5px 5px 5px; border: 1px solid black;"><p t-field="docs.number"/></td>
                                </tr>
                            </table>
                        </div>
[...]
        </template>
    </data>
</openerp>

that is the resultI get all time :

and that is the result that I want to see :

I have use this line :

<div class="page" style="page-break-after:always; background-color:white !important;">

then I get this result :

Solution

this worked for me

<div class="page" style="page-break-after: always;background-color:#fff !important;">