在图像中消失

Hello so what i'm trying to accomplish is when user clicks on a button it will fade out the question and the buttons and fade in new question and button. The questions and buttons are images so what i tried to do is create a class and add the background-image: url("../img/"image.jpg"); but then it doesn't even make the image appear. So is there any way i can fade in new image of the question and button after a click of a button. Hello so what i'm trying to accomplish is when