Pushing a small component change

Hi guys, I'm new to Prismic and I have a basic question that I couldn't find. I just needed to make a change to the css of a hero component. This change doesn't appear in sliceMachine Changes, so how can I upload it to Prismic?

Hey there! Changes to the CSS of a component are made in the source code of your project, not inside Slice Machine. Slice Machine is used for previewing slices and content modeling your page types and slices, such as adding fields and defining the structure.

Could you provide more details about what you need to change?