How to change the background color of MUI tooltips?

Question

I would like a "?" user can hover over the icon and get specifications on what data should be entered in the text field. MUI's default hover is gray with white text, but I want mine to be white with gray text and with a larger font. I found that using works fine for font size and color, but when I change the background color, the hover text field has a gray border around it. This is the hover.js component:

export default function HoverTip(prop) {
    const { tip } = prop

    return (
    <Tooltip
        title={
            <Typography
            fontSize={15}
            backgroundColor={'#ffff'}
            color={'#514E6A'}>
                {tip}
            </Typography>}
        arrow
        placement="right"
        sx={{fontSize: '30'}}
        
         >
        <IconButton>
        <HelpOutlineIcon />
        </IconButton>
    </Tooltip>
    )

}

However, this leaves a black border around the hover text box. Any idea how to solve this problem? What does it look like

Answer 1

You can use sx to solve this problem.

Now I found that using it directly on the Tooltip doesn't work, but you can use slotProps to pass it to the actual tooltip element property.

return (
  <Tooltip
    title={<Typography fontSize={15}>{tip}</Typography>}
    arrow
    placement="right"
    sx={{ fontSize: "30" }}
    slotProps={{
      tooltip: {
        sx: {
          color: "#514E6A",
          backgroundColor: "#ffff",
        },
      },
    }}
  >
    <IconButton>
      <HelpOutlineIcon />
    </IconButton>
  </Tooltip>
);