Merge pull request #554 from poanetwork/552-fix-network-dropdown

Fix dropdown hover bg color

apps/block_scout_web/assets/css/theme/_poa_variables.scss

@@ -568,7 +568,7 @@ $dropdown-box-shadow:               0 .5rem 1rem rgba($black, .175) !default;
 
 $dropdown-link-color:               $gray-900 !default;
 $dropdown-link-hover-color:         darken($gray-900, 5%) !default;
-$dropdown-link-hover-bg:            $gray-100 !default;
+$dropdown-link-hover-bg:            $primary !default;
 
 $dropdown-link-active-color:        $component-active-color !default;
 $dropdown-link-active-bg:           $component-active-bg !default;