How Can I Remove The Three Column Feature

I am not using the three column feature on my website and I cannot work out how to remove it. Can someone please give me some code I can put into the custom CSS to get rid of the three column feature?

Thank-you.

 

Okay, just worked it out. For anyone that has the same issue, just paste the following into the Custom CSS section:

.feature-content{
display:none;
}