How to change button element color

second souci : j'ai besoin de changer la couleur des boutons yes / no, et je n'y parviens pas, pourriez-vous revenir vers moi pour m'expliquer la marche à suivre ? 

Hi Clémence,

Our French Support agents are busy helping other Jotform users right now, so I'll try to help you in English using Google Translate, but you can reply in whichever language you feel comfortable using. Or, if you'd rather have support in French, let us know and we can have them do that. But, it might take a while until they're available again.

Now, coming back to your question, since the message was sent from a guest account, we're unable to access or locate the related account details. You should share the URL of the form you're working on. You can look at this guide to learn how to share your URL.

Alternatively, you can log in to your Jotform account and send us a new message.

As soon as we hear back from you, we can move forward with a solution.