change color

src/client/styles/scss/theme/_apply-colors.scss

@@ -264,6 +264,12 @@ ul.pagination {
     }
   }
 
+  .grw-sidebar-content-header {
+    .grw-icon-reload {
+      color: $gray-500;
+    }
+  }
+
   .grw-recent-changes {
     .list-group {
       .list-group-item {