How do I change the field warning pop-up box background colour of error

How do I change the field warning pop-up box background colour from the default red to a custom colour?

Hi Bruce,

I assumed you were referring to your form https://www.jotform.co/form/70368375647871

To change the error message background color, you can inject custom CSS codes to your form. Example, using the following CSS codes will change the bg color to yellow instead.

.form-line-error div.form-error-message {

    background-color: #fdc000;

}

Please let us know if you need further assistance.