feat(sidebar): add dark theme colors [EE-3666] (#7414)

app/kubernetes/components/datatables/application/containers-datatable/containersDatatable.html

@@ -3,9 +3,10 @@
     <rd-widget-body classes="no-padding">
       <div class="toolBar">
         <div class="toolBarTitle flex">
-          <div class="flex justify-center content-center mr-2 icon-nested-blue vertical-center">
-            <pr-icon icon="'server'" mode="'primary'" feather="true"></pr-icon>
+          <div class="widget-icon space-right">
+            <pr-icon icon="'server'" feather="true"></pr-icon>
           </div>
+
           <span>
             {{ $ctrl.titleText }}
           </span>