Events: Change style of "earlier event" and "later event" so it is clear they are clickable links

I'm trying to change the style of the "earlier event" and "later event" links on individual events pages so it is clear they are clickable links. ie different style to body copy style – bold and underlined. 

I would also like to do the same for the tags style (but a different style)

I'm not sure if this is possible thought the Squarespace site styles (can't find the option) or requires custom CSS. 

Any pointers gratefully recieved!!!

Screenshot attached. 

Hi,

What is event page url? We can check easier