How to change specific headings within section ids on home page

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Hey everyone

We're wanting to make some changes to our home page. Specifically we want to be able to have control over the size of our fonts, being able to underline them, and change the colour of each underline (for different sections).

We currently have the Atlantic theme, and I've managed to underline the headers in our rich text sections, but it then applies it to every rich text section there is on the home page. 

How do I:

a) target the text for specific sections

b) Change the size, weight and text decorations of the headers and body text PER section

Any help would be epic.