Reuse mobile view CSS from upstream JupyterLab

packages/notebook-extension/style/base.css

@@ -83,28 +83,3 @@
   overflow: hidden;
   white-space: nowrap;
 }
-
-/* Mobile View */
-
-body[data-format='mobile'] .jp-RetroCheckpoint {
-  display: none;
-}
-
-body[data-format='mobile'] .jp-InputArea,
-body[data-format='mobile'] .jp-OutputArea-child {
-  flex-direction: column;
-}
-
-body[data-format='mobile'] .jp-InputPrompt,
-body[data-format='mobile'] .jp-OutputPrompt {
-  flex: 0 0 auto;
-  text-align: left;
-}
-
-body[data-format='mobile'] .jp-InputArea-editor {
-  margin-left: var(--jp-notebook-padding);
-}
-
-body[data-format='mobile'] .jp-OutputArea-child .jp-OutputArea-output {
-  margin-left: var(--jp-notebook-padding);
-}