change style for comparison modal

[Miffael]

change style for comparison modal:

[ ] Change hearts on photos to + signs.
[ ] Make top section white
[ ] Add descriptive text
[ ] Make Heading bigger at top

[ ] When a photo is clicked, position it in the middle.
[ ] Add + signs on both sides. Next photo will be positioned to the left or right depending on its income. Bгt he images will be centered.

[ ] As soon as there is at least two images, The bar with Preview and Publish appear. It should look like the one above.
[ ] Clicking it gives this view:

[ ] And the “Copy link” should lead to a view that looks like this: