Passe o mouse sobre a criança do pai Mui React
<Box
sx={{
width: 300,
height: 300,
backgroundColor: "darkblue",
":hover .child": {
backgroundColor: "orange"
}
}}
>
<Box className="child" sx={{ width: 200, height: 200 }} />
</Box>
https://bilalahmed-dev.azeemlab.com/
bilalahmed_dev