Custom Checkbox / Radio Buttons Focus

I've created Custom Checkbox / Radio using: https://www.w3schools.com/howto/howto_css_custom_checkbox.asp

Now I'm facing the problem of "focus" state. These buttons don't have focus state. I tried by adding my own CSS but it's not working.

As you can see that the main element/tag is "label" which don't have focus state. And there is input tag but it's hidden.

I wonder if I can have focus state on these buttons.