Need help on Masonry Gallery Page

1. Show all the images when Sub category is click on gallery. for example by default its showing 25 data but if you click on "Scarves" its showing 1 data bcz only 1 data is inside 25 default data. I need to display 25 images for each category.

2. If you click on the image it will popup but I need a full-screen popup so the white space on top and bottom doesn't appear.
-More details:
- Image should fill all the vertical space (from the bottom of the window to the top). There must be no padding/margin on top or bottom. White space on left and right is of course understandable. If they will upload a 4:3 image, the left/right space will increase. On the other hand, if they upload a really narrow image, there will be no space on left and right but there will be on top and bottom. Do you know what I mean? In short: image should act as if you set background-size: contain. But at the same time, the image must not be up scaled. If you have a small image, there will naturally be a lot of white space around it because it’s too small to fill the whole width or height of the window.

- If you switch to full screen in your browser, then the image should fill the whole screen, but only if both image and screen have the same aspect ratio and if the image is equal or bigger than the screen. If the image is not in the same aspect ratio as the screen or if the image is smaller, then there will naturally be some white space.

- Add semi-transparent (50% black) circles behind the arrows and the close button and make those white (see the attached design).

- Position the “Designed by” on the bottom center, make it white, 16px big and add a 65% black background that spreads the full width of the screen.

- Add a “Full screen” button below the close button. This button should switch the browser to full screen.