Open the Buyer Report sample in Steel Wheels -> Reporting. Observe the blue border around the Report Parameters panel header.
The font is also not anti-aliased. this is a result of the element containing the text using a filter. this is a known issue in IE. the workaround is to use background images for IE only in these cases.
the border is most likely due to the css styling of the "a" element for IE since this is what this generated for that panel.