As far as I can tell there is no way to remove the border which appears around the facet chat.
Could we get a setting added to toggle this on or off?
It sticks out on the page as nothing else of ours has a border.
The border is actually drawn using CSS styles.
advanced.themeCSSClass
Or you may use this setting
theme: ZoomCharts.TimeChart.themes.flat as here http://jsfiddle.net/22kkt0vt/2/
But Karlis approach is better. TimeChart theme contains settings that are not applicable on FacetChart, thus you will find some warnings in console.
Janis
The approach 2 is not workable at ver 1.16.0.
Yes, we have introduced a small bug that prevents setting the themeCSSClass to empty string. The quick workaround is to use a non-existent class name instead, see http://jsfiddle.net/heochoxz/4/
themeCSSClass
We will fix this and release a hotfix.