removed shadow on modified edior

changed selection background color

app/assets/stylesheets/pages/repo.scss

@@ -235,6 +235,10 @@
   }
 
   .monaco-diff-editor.vs {
+    .editor.modified {
+      box-shadow: none;
+    }
+
     .diagonal-fill {
       display: none !important;
     }
@@ -242,7 +246,7 @@
     .diffOverview {
       background-color: $white-light;
       border-left: 1px solid $white-dark;
-      cursor: move;
+      cursor: ns-resize;
     }
 
     .diffViewport {
@@ -286,7 +290,7 @@
 
     .margin-view-overlays .insert-sign,
     .margin-view-overlays .delete-sign {
-      opacity: .3;
+      opacity: .4;
     }
   }
 }

ee/app/assets/javascripts/ide/lib/themes/gl_theme.js

@@ -8,6 +8,7 @@ export default {
       'editorLineNumber.foreground': '#CCCCCC',
       'diffEditor.insertedTextBackground': '#ddfbe6',
       'diffEditor.removedTextBackground': '#f9d7dc',
+      'editor.selectionBackground': '#aad6f8',
     },
   },
 };