how do i customise everything on my gamepage like this game: https://managore.itch.io/walkie-talki

i know you can change the background and add some pictures but how do i move the download button  or move the text to a specific place like have all the writing in the middle of the page.

Also the owner of the custom game page also has a custom profile page : https://managore.itch.io/

like on his profile page he has pictures that move up when you hover over them.