Simple color change to typography

I’m in the process of building a new site for the company but am having trouble with changing the colour of some type. The issue is for Blog posts, and at the bottom, the type that says ‘Previous Post’and ‘Next Post’ are both transparent in color and I have no idea why. I tried to add some CSS changes to .title but nothing happened. Can anyone assist? The blog titles underneath these words appear in the correct color I have no idea why this don’t show up unless you highlight them to see they do exist.