Yes, you can use your own cascading style sheet (CSS) to customize the look of your contact form. Styling forms with CSS is a great opportunity to add your company’s brand on the form, not to mention it offers a lot of flexibility during creation. Styling forms with CSS is quite simple on 123FormBuilder. You have to paste the code or enter the URL to the CSS file in Edit – Themes – Add custom CSS.
The changes will automatically take effect on your form. Hit the View icon to see the results.
Learn about Full CSS Form Customization.