You can do this by using CSS. Read about our CSS form generator to learn more.
In short, you need to retrieve the field ID or class by inspecting the form code and then apply your preferred CSS style to it in the Design section of your form. After you have the CSS code, all you have to do is to click on Add CSS button and input your code.
Our form builder provides a substantial amount of design features that don’t require coding. Check out our Form Designer page for more info.