@material-ui/stylesのmakeStyles

import { AppBar, Toolbar, Typography } from "@material-ui/core";
import React from "react";
import useScrollTrigger from "@material-ui/core/useScrollTrigger";
import { makeStyles } from "@material-ui/styles";

function ElevationScroll(props) {
  const { children, window } = props;

  const trigger = useScrollTrigger({
    disableHysteresis: true,
    threshold: 0,
    target: window ? window() : undefined,
  });

  return React.cloneElement(children, {
    elevation: trigger ? 4 : 0,
  });
}

const useStyles = makeStyles((theme) => ({
  toolbarMargin: {
    ...theme.mixins.toolbar,
  },
}));

const Header = () => {
  const classes = useStyles();
  return (
    <React.Fragment>
      <ElevationScroll>
        <AppBar>
          <Toolbar>
            <Typography variant="h3">Header</Typography>
          </Toolbar>
        </AppBar>
      </ElevationScroll>
      <div className={classes.toolbarMargin} />
    </React.Fragment>
  );
};

export default Header;