WordPress provides " Add Media " feature where you can add an image gallery.

I am replicating few steps how we do that.

When the default WordPress theme is installed this is how it looks like →

Question:

Just like we customize the default WordPress comment system in the front end how can we customize this for the gallery the way we want to look this in the front-end?

Update →

Currently everything is coming under the above div. how can we change the whole HTML structure?

Read more here:: How do I customize the HTML of galleries?