Here's the CSS code that goes in the HEAD of your document: 
<style type="text/css">
	<!--
	.newstitle {
font: 10pt arial, sans-serif;
font-weight: bold;
background: EEEEEE;
	}
	-->
</style>
And here's how it makes the newsfeed look:

Note that you can change the font size by changing the following line in the CSS code: 

font: 9pt arial, sans-serif;
Likewise, you can also change the other variables, such as font-weight, background color, etc.

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