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You need to inject custom CSS code. Go to Preferences. Click on Form Styles tab and find Inject Custom CSS field.
There add the following line(with yellow background) in your Inject Custom CSS field.
The yellow line is what you have to add to your custom CSS.
I provided this guide for you so you can achieve your goal easier.
Please let me know if i can be of more assistance.
It worked! Thanks for your help.