White Border- CSS

Hello, I've been editing the themes through CSS. I edited the border, the title, and even put an image in the main content. I'm just missing the last piece of the puzzle. There is white surrounding the main content, and title, but not the outside border. Where in the CSS is this? I am new to Outsystems, so the answer may be obvious to someone,

Edward -

I suggest that you view this in your browser, use the developer tools in your browser to do "Inspect Element", and the CSS details will show you which line on which stylesheet is responsible for each aspect of the styling. That will let you track it down to the right place.

That said, once you figure out the class that is the offender, you should probably override it in your theme, instead of trying to change that CSS directly.