fix: set background color for resize button

Author: arjunlalb

projects/components/src/navigation/navigation-list.component.scss

@@ -43,6 +43,7 @@
     border-radius: 0 6px 6px 0;
     cursor: pointer;
     color: $gray-7;
+    background: white;
 
     &:hover {
       color: $gray-4;