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The backdrop component is used to provide emphasis on a particular element or parts of it.

The backdrop signals to the user of a state change within the application and can be used for creating loaders, dialogs and more. In its simplest form, the backdrop component will add a dimmed layer over your application.

<Button variant="outlined" color="primary" onClick={handleToggle}>
  Show backdrop
<Backdrop className={classes.backdrop} open={open} onClick={handleClose}>
  <CircularProgress color="inherit" />