Hi Chandni,
You can apply as much CSS as you want in Odoo. You can do this either inline (in the XML file) or by adding a new CSS file to your module.The inline code works just as if you write in HTML. A little example:
<table border="1" style="width:100%;">
<tr style="font-weight:bold;">
<td>Jill</td>
<td>Smith</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
</tr>
</table>
You can view a fiddle here: https://jsfiddle.net/cc72g35v/1/
If you want to work with a CSS file you can include it in your __openerp__py like this:
{
'css': ['static/src/css/my_css.css'],
}
Yenthe