Hi there, the below CSS can change the background color of the answer options to white:
.Skin label.MultipleAnswer, .Skin label.SingleAnswer {
    background: #ffffff !important;
}

or maybe you can set it out to none, i.e. set background to none and it should work w/o any color.

Hi Tom_1842 , how should we adapt the code if we want to use it just for a specific question? Thanks!

Hi silad , try adding the below to the question's JavaScript:
jQuery("#"+this.questionId+" .SingleAnswer").css("background","#ffffff");
jQuery("#"+this.questionId+" .MultipleAnswer").css("background","#ffffff");