In the following page I created an element that will show/hide a video and some extra text. I want to switch the image of the "read more" button to "read less". I did this now by putting 2 images on top of eachother and making the "read less" image visible on click. But, since I can't figure out how to make the "read more" image invisble I have to make the read less button non-transparant so it completely overlays the read more image. Problem with this is that I get a white background which becomes visible on the white/light gray background of the website.
Does anyone knows how I can fix this?