how to overwrite CSS class by using online CSS code

[liunx]

Hi friends,
I have a problem. We use class to control table properity in CSS file. The special issue. My client want to modify this table TD field with different width for each row.
I try to make online CSS in each column < TD tag>to overwrite class in CSS file. Such as '<td style="width: 12%; text-align: center"' || l_tdclass || to_char(xx.e_ent_date, 'mm/dd/yyyy') || '</td>'

But it is not work.

How do I can change td field width in Dynamical CODE by Oracle web server.
Also which means about position: relative;
Also which means about width: 100%;;
Thanks for help. I am new CSS person

Nice weekend
Jim
**********below class control table. But I want to make column with different width in each row?

Thanks for any help with example.
CSS class:
{position: relative;
font-size: 12px;
font-weight: regular;
color: #000;
text-align: right;
background-color: #A5C9A5;
vertical-align: top;
text-align: left;
margin: 0px 0px 0px 0px;
padding: 0px 0px 0px 0px;
width: 100%;
}You can't. A given column can only have one width.