network-resurrector/src/components/layout/Main.js

import React from "react";
import ApplicationStepper from "./stepper/ApplicationStepper";
import Switcher from "./Switcher";
import { makeStyles } from "@material-ui/core/styles";

const useStyles = makeStyles(theme => ({
  app: {
    textAlign: "center",
    backgroundColor: "#282c34",
    minHeight: "100vh",
    display: "flex",
    flexDirection: "column"
  },
  content: {
    minHeight: "80vh",
    display: "flex",
    flexDirection: "column",
    alignItems: "center",
    justifyContent: "center",
    fontSize: "calc(10px + 2vmin)",
    color: "white"
  }
}));

const Main = () => {
  const classes = useStyles();

  return (
    <div className={classes.app}>
      <ApplicationStepper />
      <header className={classes.content}>
        <Switcher />
      </header>
    </div>
  );
};

export default Main;