Button Lightbox Gallery

Hey guys, how can I create a button to open a lightbox gallery in blocs? Thanks for your support.

The easiest option is to create a button in a graphics app essentially making an image of a button. Place this in the page and have it open a lightbox, specifying an alternative image (the first image you want to display). You can then create your gallery as normal and use visibility to hide it from page view. Sample image button below.