Order by dropdown font colour

I am using Fruitful theme and it’s great.
I have just changed the background colour and have been able to change most font colours except the sort by header in the drop box. I can see when I inspect element it comes from woocommerce but there is no place for me to change the colour and you can’t read the letters.
Does anyone know what I have to do? I have looked under the hood but I am not experienced and don’t want to mess up my site.
https://www.funkyweddingideas.com.au.

Thank You
Tanzi