Material-UI Typography doesn't center in AppBar - css

Question

I'm trying center the text in an AppBar. I've tried centering the text in Typography element, using align="center", textAlign="center", and style={{ align: "center" }}, among others:
class App extends React.Component {
render() {
return (
<div>
<AppBar>
<Toolbar>
<Typography
variant="h6"
color="inherit"
style={{ align: "center" }}
>
Header
</Typography>
</Toolbar>
</AppBar>
</div>
);
}
}
ReactDOM.render(<App />, document.getElementById("app"));
... but is doesn't work unless I remove the Toolbar. But then I would have to manually change the height of the AppBar, which I've also not found a way to do. In addition, every instance I've seen of the AppBar uses the Toolbar. All the solutions that I've found that could address this are outdated and don't work (there's no such thing as a ToolbarGroup anymore).
I've also tried using a const styles and exporting the AppBar withStyles():
const styles = {
root: {
flexGrow: 1
},
typography: {
align: "center"
}
};
function Header(props) {
const { classes } = props;
return (
<div className={classes.root}>
<AppBar>
<Toolbar>
<Typography
variant="h6"
color="inherit"
className={classes.typography}
>
Header
</Typography>
</Toolbar>
</AppBar>
</div>
);
}
Header.propTypes = {
classes: PropTypes.object.isRequired
};
export default withStyles(styles)(Header);
but it also doesn't work. I'm thinking this should be simple, I'm not sure what I'm missing.

Answer 1

The AppBar component is styled to render its children as flex items.
CSS property like text-align is used for horizontal alignment of children that is displayed different from a flex item e.g. as a table cell, block or inline-block.
Flex items can be centered horizontally using the justify-content or align-self CSS Property or more other ones.
const styles = {
root: {
flexGrow: 1,
},
appbar: {
alignItems: 'center',
}
};
function Header(props) {
const { classes } = props;
return (
<div className={classes.root}>
<AppBar
className={classes.appbar}
color="default"
position="static"
>
<!--...-->
</AppBar>
</div>
);
}

Answer 2

const styles = {
root: {
flexGrow: 1
},
typography: {
flexGrow: 1,
align: "center"
}
};
function Header(props) {
const { classes } = props;
return (
<div className={classes.root}>
<AppBar>
<Toolbar>
<Typography
variant="h6"
color="inherit"
className={classes.typography}
>
Header
</Typography>
</Toolbar>
</AppBar>
</div>
);
}
Header.propTypes = {
classes: PropTypes.object.isRequired
};
export default withStyles(styles)(Header);
use flexGrow,
will do the trick and is responsive in mobile also

Answer 3

Adding the following helped me center my title on mobile:
<Box sx={{ flexGrow: 0 }}>
<Box style={{ width: '40px', height: '40px' }}></Box>
</Box>