diff --git a/DefaultUI/SerializeReferenceInspectorButton.cs b/DefaultUI/SerializeReferenceInspectorButton.cs
index d89b937..ba34cdb 100644
--- a/DefaultUI/SerializeReferenceInspectorButton.cs
+++ b/DefaultUI/SerializeReferenceInspectorButton.cs
@@ -1,5 +1,4 @@
 #if UNITY_EDITOR
-
 using System;
 using System.Collections.Generic; 
 using UnityEditor;
@@ -7,39 +6,33 @@ using UnityEngine;
 
 public static class SerializeReferenceInspectorButton
 {
-    public static readonly Color SerializedReferenceMenuBackgroundColor = new Color(0.1f, 0.55f, 0.9f, 1f);
-
     /// Must be drawn before DefaultProperty in order to receive input
-    public static void DrawSelectionButtonForManagedReference(this SerializedProperty property,  Rect position, IEnumerable<Func<Type, bool>> filters = null) =>  
-        property.DrawSelectionButtonForManagedReference(position, SerializedReferenceMenuBackgroundColor, filters);
-    
-    /// Must be drawn before DefaultProperty in order to receive input
-    public static void DrawSelectionButtonForManagedReference(this SerializedProperty property, 
-        Rect position, Color color, IEnumerable<Func<Type, bool>> filters = null)  
-    { 
-  
-        var backgroundColor = color;   
-            
-        var buttonPosition = position;
+    public static void DrawSelectionButtonForManagedReference(this SerializedProperty property, Rect position, IEnumerable<Func<Type, bool>> filters = null)  
+    {
+        Rect buttonPosition = position;
         buttonPosition.x += EditorGUIUtility.labelWidth + 1 * EditorGUIUtility.standardVerticalSpacing;
         buttonPosition.width = position.width - EditorGUIUtility.labelWidth - 1 * EditorGUIUtility.standardVerticalSpacing;
         buttonPosition.height = EditorGUIUtility.singleLineHeight;
 
-        var storedIndent = EditorGUI.indentLevel;
+        Color storedColor = GUI.backgroundColor;
+        int storedIndent = EditorGUI.indentLevel;
         EditorGUI.indentLevel = 0;
-        var storedColor = GUI.backgroundColor;
-        GUI.backgroundColor = backgroundColor; 
-         
+
+        (string AssemblyName, string ClassName) = ManagedReferenceUtility.GetSplitNamesFromTypename(property.managedReferenceFullTypename);
+       
+        bool isNull = string.IsNullOrEmpty(ClassName);
+        GUI.backgroundColor = isNull ? Color.red : storedColor;
         
-        var names = ManagedReferenceUtility.GetSplitNamesFromTypename(property.managedReferenceFullTypename);
-        var className = string.IsNullOrEmpty(names.ClassName) ? "Null (Assign)" : names.ClassName;
-        var assemblyName = names.AssemblyName;
-        if (GUI.Button(buttonPosition, new GUIContent(className, className + "  ( "+ assemblyName +" )" )))
+        string className = isNull ? "Null (Assign)" : ClassName;
+        string assemblyName = AssemblyName;
+
+        if (GUI.Button(buttonPosition, new GUIContent(className, className + "  ( "+ assemblyName +" )")))
+        {
             property.ShowContextMenuForManagedReference(buttonPosition, filters);
+        }
         
         GUI.backgroundColor = storedColor;
         EditorGUI.indentLevel = storedIndent;
     }
 }
-
 #endif
\ No newline at end of file