message: [Day] Accept font-family from typography
diff: @@ -16,6 +16,7 @@ const muiComponentConfig = { name: 'MuiPickersDay' };
  export const useStyles = makeStyles(
  theme => ({
  day: {
  + ...theme.typography.caption,
  width: DAY_SIZE,
  height: DAY_SIZE,
  borderRadius: '50%',
  @@ -23,8 +24,6 @@ export const useStyles = makeStyles(
  // background required here to prevent collides with the other days when animating with transition group
  backgroundColor: theme.palette.background.paper,
  color: theme.palette.text.primary,
  - fontSize: theme.typography.caption.fontSize,
  - fontWeight: theme.typography.fontWeightMedium,
  '&:hover': {
  backgroundColor: fade(theme.palette.action.active, theme.palette.action.hoverOpacity),
  },
  