Registration button CSS

-- HikaShop version -- : 4.2.3
-- Joomla version -- : 3.9.16
-- PHP version -- : 7.2

Just helping out someone with their Essential site, and they have an issue with the Register button not being visible.

I'm guessing it is a CSS issue, but I've never got in to CSS stuff before, so I'm a bit lost.

I've had a bit of a fiddle with things, but I think I might be doing more harm than good with their site.

Their Joomla template is JP-Universal.

Would appreciate it if someone could tell us how to get ourselves out of this spot, as in changing the color of this particular button.

From what I can work out it is the hikabtn_checkout_login_register is what needs to be changed.

Thanks.

I think I've worked it out for myself with the css..... thanks for getting back to us.