Hello,

You can directly use <style> tag in your Qweb report.

Kindly check this issue 

Regards,

Hello Karthik,

use this for add your custom css in report 

<openerp>

<data>

<template id=my_own_css_template" inherit_id="report.minimal_layout">

<xpath expr="//head" position="inside">

<link rel="stylesheet" href="/test_qweb/static/src/css/sst.css" />

</xpath>

</template>

</data>

</openerp>