Class for .vc_tta-panel-body is always showing as color #ef4836.  This appears to come from custom-style.php and be tied to the accent color. 
However if I change the accent color then the background-color does not change for the .vc_tta-panel-body.

On the demo page here http://trendytheme.net/demo2/wp/nominee/onepage/#about we see the white background for panel body.  
On my page here http://test.writeingeorge.com/#abilities we see the red background.