WordPress fix How do i make this HTML link white?

WordPress Speed Up Service | WordPress Website Maintenance Packages

How do i make this HTML link white?, by proteinpulvertest

Hi,

At the bottom left of my website : http://www.veganskmat.no/ , I’m linking to a few other websites. I would like these link-texts to appear white, how can i do so?

The code i use is: <a href="http://www.strangelist.com">top 10 lists, all kinds of strange lists</a>

I was suggested this :
You can add a class to your link, like this:

<a class="link-white" href="http://www.strangelist.com">top 10 lists, all kinds of strange lists</a>

And then you can add the following CSS from Appearance > Customize > Additional CSS:

.link-white { color: #FFF; }

But nothing changed. Someone guide me please

How do i make this HTML link white?