Changing the heading colour in footer is not working

Hi guys. Outstanding theme. I have been using for several years.

I know how and where to change the colour of headings that appear in the footer, but even though I have it set to white, it is still using the main purple of my theme. I have pasted the link to the site in the private content section.

Please advise how I change the colour of the headings in the footer. I’ve done it under the styling, and I also tried changing the colour of the the widget titles to white, but nothing has worked. Please note that when I change it, I only want it to change in the footer, I don’t want it to change the headers elsewhere on the site to white as well! (I know that’s obvious, but I just wanted to be clear!)

Thanks in advance!