CSS for dropdown placeholders

I've tried every CSS trick in my book! I'm hoping someone else's book is a lot bigger than mine! :slight_smile:
I have a form and all the placeholders on there are in grey. The Dropdown placeholders however are black. This is bothering my client but I can't change it. I tried everything. any ideas?
Here is the form example: https://snag.gy/MW5Ej3.jpg