If this doesn’t make the cut for big enough issue, feel free to close with extreme prejudice. 
Dropdowns, e.g. while editing category permissions:
And on admin/badges are rather difficult to read. I’m currently using:
body input, body select {
color: #000;
}
But since CSS customizations are stripped out of admin I tend to get the light grey on white a fair amount, and it might be good to have fixed in general.