.bottle{opacity:0;}
.item1:hover .bottle {opacity:1;}
<div class="responsive-picture item1">
<img src="./images/glass.png">
<div class="bottle"><img src="images/bottle.png"></div>
</div>
So if I hover on the image of glass.png, bottle.png gets opacity and appears. But I can't get this structure in SD when adding pictures. The best I can do is get the pictures side by side in a division, but then the hover doesn't trigger the effect on the other element. I tried to find a solution with foundation, but I'm not smart enough for that.

Maybe someone has a solution? Many thanks.