Overlaying my image gallery over my background image


i am completely new to HTML/CSS and currently doing my first project with uni to create a basic website based on a travel website. On my home page i have a full page background and a navigation bar at the top and 4 small images in an image gallery with a caption at the bottom of the page currently, i have been trying for ages to figure out how to get the image gallery to go across the center of my background image.

Would someone be able to provide an example of what i have described so i can work off it and see what i was doing incorrect.

Thanks for any help!

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