Ibrahim Dembele idembele70

For example, to override the AppBar (https://material-ui-next.com/api/app-bar/) root class we can do the following:

First method (override Material UI classnames):

1 - Add the property classes in the AppBar component:

    <AppBar classes={{root: 'my-root-class'}}

	[
	{ country: 'Australia', code: 'AU' },
	{ country: 'Austria', code: 'AT' },
	{ country: 'Belgium', code: 'BE' },
	{ country: 'Brazil', code: 'BR' },
	{ country: 'Bulgaria', code: 'BG' },
	{ country: 'Canada', code: 'CA' },
	{ country: 'Croatia', code: 'HR' },
	{ country: 'Cyprus', code: 'CY' },
	{ country: 'Czech Republic', code: 'CZ' },