Newbie - edit core css Please help

Good day

Wow love this cms..thanks

I need the following help please;

I have create an home page lay-out and added the widget Free Html

It works fine - But in the field Custom CSS class: I added a clas called "top"

I have added the following code in the bottom of the core.php file located at views/default/css/elements

the code:

.top {
background:#000000;
}

I have allso disabled the cash in adminstrator setting?

I just want to update the look and feel of the widget via css, but not getting it to work?

Please view image below

image

Please help

Beginning Developers

Beginning Developers

This space is for newcomers, who wish to build a new plugin or to customize an existing one to their liking