Change color of labels in registration form

I am trying get the text visible in my registration form as it is now black on a black background. I have tried already changing some CSS, but I can not find the solution. I am using Joomla 2.5 with latest version of Hikashop

Can someone tell me where to change the css with what kind of code? I have a printscreen attached, see the labels such as username are missing.

Hi,

Could you try this property:

.hikashop_checkout_login .hikashop_contentpane{
    color: white !important;
}

hmm, I can not get it to work. Should I put it in a specific area in the custom css?
I am quite new to html

Hi,

No, you can place it where you want. At the end would be better.