How do I update the padding | Forums?

I'd like to increase the padding-bottom and padding-top from 5px to 20px, but I'm not sure where to start:

element.style {
  border:1px solid #FFFFFF;
  border-collapse:collapse;
  padding-bottom:5px;
  padding-top:5px;

It says it's "inherited from table" ... which is in bootstrap, but I don't see the specific pieces of code within bootstrap. I know my approach is flawed, so I was wondering if anyone could tell me what I'm doing wrong so I can address this.

Thanks!