Fix Prettier formatting and ESLint warning

notebook/custom/custom.css

@@ -6,9 +6,9 @@ mainly to be overridden in profile/static/custom/custom.css
 This will always be an empty file
 */
 .jp-RunningSessions-section {
-    min-height: 50px !important;
-    max-height: 100px !important;
-    overflow: auto !important;
+  min-height: 50px !important;
+  max-height: 100px !important;
+  overflow: auto !important;
 }
 
 .lm-AccordionPanel-title {

ui-tests/test/mobile.spec.ts

@@ -1,7 +1,7 @@
 // Copyright (c) Jupyter Development Team.
 // Distributed under the terms of the Modified BSD License.
 
-import { IJupyterLabPage, expect, galata } from '@jupyterlab/galata';
+import { expect, galata } from '@jupyterlab/galata';
 
 import { test } from './fixtures';