react-test/docs/data/material/customization/how-to-customize/DynamicCSS.tsx

import * as React from 'react';
import { alpha, styled } from '@mui/material/styles';
import Slider, { SliderProps } from '@mui/material/Slider';
import FormControlLabel from '@mui/material/FormControlLabel';
import Switch from '@mui/material/Switch';

interface StyledSliderProps extends SliderProps {
  success?: boolean;
}

const StyledSlider = styled(Slider, {
  shouldForwardProp: (prop) => prop !== 'success',
})<StyledSliderProps>(({ theme }) => ({
  width: 300,
  variants: [
    {
      props: ({ success }) => success,
      style: {
        color: theme.palette.success.main,
        '& .MuiSlider-thumb': {
          [`&:hover, &.Mui-focusVisible`]: {
            boxShadow: `0px 0px 0px 8px ${alpha(theme.palette.success.main, 0.16)}`,
          },
          [`&.Mui-active`]: {
            boxShadow: `0px 0px 0px 14px ${alpha(theme.palette.success.main, 0.16)}`,
          },
        },
      },
    },
  ],
}));

export default function DynamicCSS() {
  const [success, setSuccess] = React.useState(false);

  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    setSuccess(event.target.checked);
  };

  return (
    <React.Fragment>
      <FormControlLabel
        control={
          <Switch
            checked={success}
            onChange={handleChange}
            color="primary"
            value="dynamic-class-name"
          />
        }
        label="Success"
      />
      <StyledSlider success={success} defaultValue={30} sx={{ mt: 1 }} />
    </React.Fragment>
  );
}