text fields is black

hello

I have installed this plugin and all works fine.
But the text fields is gay and text field to email is white
When the user click on the field is be white.

I want the fields is white all the time.

I have tried to fix it in the style.css
But not successful.

how do i fix this?
Image: https://peecee.dk/uploads/112013/123546.png

https://www.ads-software.com/plugins/contact-form-7/