Custom theme json for botton

Hello!

I'm trying to create a custom theme and I have only the buttons left. I would like to be able to limit the line thickness of the icons and also change the background color, transparency and font color of the ditintos button states. (on, off, etc.).

Does anyone have the json code?

I have found this:

{"name": "ButtonTemplate",
"visualStyles": {
"actionButton": {
"*": {
"visualHeader": [{
"show": true
}]}}}}

But that's not enough.