score:1

Accepted answer
import { Dialog, DialogContent } from "@material-ui/core";
import { makeStyles } from "@material-ui/styles";
const useStyles = makeStyles({
  root: {
    borderWidth: "20px",
    borderColor: "rgba(0,0,0,0.2)",
    borderStyle: "solid"
  }
});
export default function App() {
  const classes = useStyles();
  return (
    <div className="App">
      <Dialog open PaperProps={{ classes: { root: classes.root } }}>
        <DialogContent>Some Content</DialogContent>
      </Dialog>
    </div>
  );
}

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