Adding a ready made photo gallery under the ionic header for example

Um trying to have a photo gallery in my web app … (ready ones like “Gamma Gallery” for example) it works perfectly until i try to put it under the ionic header it just stops functioning well! I have tried many other galleries and it’s just the same!

Any ideas for how to have it working … or any ideas for another good photo gallery (i want it a very simple one for a mobile app)

Many thanks…