What css classes are available

I note that form elements have a CSS Class field when adding a custom field but I do not know the syntax or available classes.
For example class to bold or color a message text?

Hello Ric

We don't have available css classes like that. Mostly, you can only use the css classes provide by twitter bootstrap to control size of the input:

1. input-small
2. input-medium
3. input-large
4. input-xlarge
5. input-xxlarge

If you want to control css like that, you can define the custom css classes you want. Go to Membership Pro -> Configuration, look at Custom CSS tab, add the custom css classes you want and use these new css classes for the fields

Regards,

Tuan

Great thanks but I need a little help with the syntax to add a customn css class

eg can you show me the way to define a css class for font colors

Hello.
This is the syntax to add css in to custom.css file.
.class-name {
color: color-code-you-want (ex: #000000; )
font-size: font-size-you-want (ex: 16px)
}
Thanks.

I sort of understand
If I go to membership pro and insert the following into custom css
.color-red {FFFFFF;}
then in the custom field under css class
color-red
then the text should go red?
except it does not so I am missing some syntax can you advise what i have done wrong please