How to customize the Semantic UI buttons(background-color, border-radius and all)
You can also add semantic ui's classes before your own for specificity.
For example : if your className is .create-new-menu-btn
you can add in css or scss before ui.button
or any other semantic ui specific clas that you neeed. So in the end, your class definition in css would look like this:
ui.button.create-new-menu-btn {
....
}