Color of radio buttons

Hi,
I have the same question again as in this topic:
https://support.balbooa.com/forum/joomla-forms/11326-how-to-change-the-color-of-the-radio-buttons

If I place that css code in the css code editor, I see that the radio buttons in the form in the backend become a black circle, but on the frontend it is only visible when hovering with the mouse.

What is the correct CSS code that makes the circles of the radio buttons always visible?

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