title: Set the background color of a Snackbar in MUI
body: <p>I am using a <code>Snackbar</code> component from MUI. At the moment the <code>Snackbar</code> appears in black. Do you know how I can change the color? Setting background-color only changes the color of the whole div in which the <code>Snackbar</code> is presented. It does not change the color of the <code>Snackbar</code>.</p>