Border does not take the color from widget settings

It doesn’t matter in what color I set the settings of the facebook like box widget, the border stays visible in a black and blue color. No matter what I do it doesn’t change. Is there a solution for this? You can see it on my website tuincentrumvaneeckhaut.be in the footer.

https://www.ads-software.com/extend/plugins/cardoza-facebook-like-box/