Hi
@mls148
Go to Look & Feel -->Style--> Custom CSS-->Click on 'edit' and add below code there. I have kept black(#000000) you can change as per your wish -
.Skin label.MultipleAnswer>span::before {border:2px solid #000000!important; }
.Skin label.SingleAnswer>span::before{border:2px solid #000000!important; }
.Skin label.MultipleAnswer.q-checked>span::before {border:2px solid #000000!important; background-color:#000000!important;}
.Skin label.SingleAnswer.q-checked.q-focused>span::before{border:2px solid #000000!important; background-color:#000000!important;}