custom styling for material UI tooltip arrow?

Question

I would like to add a custom style for Material UI tooltip arrow but I can not set the border color and the background color.

This is the configuration I have - react:

const useStylesBootstrap = makeStyles(theme => ({
arrow: {
    // color: '#E6E8ED',
    border: '1px solid #E6E8ED',
},
tooltip: {
    backgroundColor: theme.palette.common.white,
    border: '1px solid #E6E8ED',
    color: '#4A4A4A'
},

}));

This is what I want to achieve:

I want to apply a gray color in the triangle border and the background will be white.

On the arrow configuration, the border config will not work, it will apply a border color in the square that's housing the triangle. Without material UI, the issue could be solved using the pseudo :before and :after to achieve the desired output. I would like to know if there is a solution to this using material UI custom configuration. Not too familiar with Material UI, your help will be appreciated

Answer 1

You are right, You need to override &:before pseudoselector like this. Here is the code sandbox project link

import React from "react";
import Button from "@material-ui/core/Button";
import Tooltip from "@material-ui/core/Tooltip";
import { makeStyles } from "@material-ui/core/styles";

const useStyles = makeStyles(theme => ({
  arrow: {
    "&:before": {
      border: "1px solid #E6E8ED"
    },
    color: theme.palette.common.white
  },
  tooltip: {
    backgroundColor: theme.palette.common.white,
    border: "1px solid #E6E8ED",
    color: "#4A4A4A"
  }
}));

export default function ArrowTooltips() {
  let classes = useStyles();

  return (
    <Tooltip
      title="Add"
      arrow
      classes={{ arrow: classes.arrow, tooltip: classes.tooltip }}
    >
      <Button>Arrow</Button>
    </Tooltip>
  );
}