Please note that currently, it is not possible to set css styles to the <input> tag for example. We have a feature request logged in our feedback portal and hopefully we will be able to implement this for our future releases. Here is the link
to the description of the feature request where you can vote to increase its popularity.
One of the options will be to create custom form field controls in your Sitefinity projects using Thunder. You may checkout the following video
for more details on how to create it and add your custom logic for the field.
In addition to this, you may find useful the following article
where we have listed the css classes we are using for the forms widget. As you can see from this article, we use for example the sfTxt
class for the <input>
element in the Textbox
widget. So, another option will be to apply your custom styles to the built-in css classes using the !important
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items