What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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I have checked your form, which is this :
And I'm able to see the black color in the drop down field, now I made some test and was able to change it, please follow these steps in order to change the color of your field.
1. Go to Designer:
2. Go to the CSS tab, paste the following CSS code and Save :
This is the result :
Let us know if it works in your end, if not, we will be glad to assist you.