fix ripple style

Author: oliviertassinari

packages/material-ui/src/Breadcrumbs/BreadcrumbCollapsed.js

@@ -8,15 +8,15 @@ import ButtonBase from '../ButtonBase';
 const styles = theme => ({
   root: {
     display: 'flex',
+    marginLeft: theme.spacing(0.5),
+    marginRight: theme.spacing(0.5),
   },
   icon: {
     width: 24,
     height: 16,
     backgroundColor: theme.palette.grey[100],
     color: theme.palette.grey[700],
     borderRadius: 2,
-    marginLeft: theme.spacing(0.5),
-    marginRight: theme.spacing(0.5),
     cursor: 'pointer',
     '&:hover, &:focus': {
       backgroundColor: theme.palette.grey[200],