Customise CSS…

Hi,

I try to customise your table over custom css, what I created and putted in the table:

.taboversmallhead {
	font-size: 10px;
	font-weight: bold;
    text-align: center !important;
	margin: auto;
	background-color: #eef5f9;
}

and muted this code to the table:

<p class="taboversmallhead">MICRO CASES</p>

but as you can see here: https://www.grand-tech.eu/2/overview/

the background color doesn’t fulfil the table cell.
Please can you help me how to modify the CSS that the background color fulfil the whole table cell.

Thanks.