You can use this plugin to create menus in HTML (javascript, css, Jquery ect.).
Menus in HTML offer much more possibilities than in UMG.

There is an incredible amount of documentations, examples and support on the internet.
For example, you want to create a button? Just google "HTML Button Generator" and you will land on this website.
Copy HTML and CSS and you have an individual button for your game.

This plugin uses UE4's internal browser and extends it with essential functions.
These functions are provided by this plugin.

Consider following: