Changing Button Size

Hello all, can anyone please tell me how to increase the size of the portal button on the dawn theme home page. (the one under the description and title in the cover.hbs section)

I also want to remove some padding between Latest Issues of Cut/daily and the list below it.
(I simply duplicated the section header above it and add this to the correct part of the page.)

my site is

I’m assuming these are all CSS changes?

many thanks