Hello Eric,

It's not possible to add a custom prefix but because we already added a lot of details on the custom fields, you could style it accordingly. Let me give you an example,

Assuming that you want to alter the design of the gender field as you can see from my screen shot here, http://take.ms/bHw40 . There is a data attribute with the field id appended to it. So one could add a code like this, to style the entire row,

[gist]
body [data-field-1621] {
background: #000;
}
[/gist]

Good evening,
Thank you for your prompt response.
Do I have to change like that?


http://www.web-libertins.com/images/tests/Style%20field.png

Hm, are you trying to modify the header field or a text field?

Finally, I use a Header field which allows me to intervene on its CSS

Thanks for updating Eric, glad that your issues are resolved now