How the remove the line under the label when we split check boxes into two columns?

Hi all,

I have created a service catalog with set of questions and checkbox,In that I created a variable with 3 choices (splited in two columns) of check boxes. I used container start,Label and container split but still I'm not meeting my requirement.But there is the line under the question (Refer the image)

Is there a way I can remove the line under the question? 

If yes. Please suggest some solution

Thanks in advance