diff --git a/material_maker/darken.gd b/material_maker/darken.gd
index 48bc3e01c..25e40d64b 100644
--- a/material_maker/darken.gd
+++ b/material_maker/darken.gd
@@ -3,7 +3,9 @@ extends ColorRect
 func _ready():
 	var current_theme : Theme = mm_globals.main_window.theme
 	color = current_theme.get_stylebox("panel", "Panel").bg_color
-	color.a = 0.80
+	modulate.a = 0.0
+	var tween = get_tree().create_tween()
+	tween.tween_property(self, "modulate:a", 0.8, 0.5).set_trans(Tween.TRANS_CUBIC)
 	_on_resized()
 
 func _on_resized():
diff --git a/material_maker/darken.tscn b/material_maker/darken.tscn
index 3e59f8ab1..4f107f881 100644
--- a/material_maker/darken.tscn
+++ b/material_maker/darken.tscn
@@ -1,6 +1,6 @@
 [gd_scene load_steps=2 format=3 uid="uid://cmeh4ewlvp7vx"]
 
-[ext_resource type="Script" path="res://material_maker/darken.gd" id="1"]
+[ext_resource type="Script" uid="uid://du7vv67kc65qb" path="res://material_maker/darken.gd" id="1"]
 
 [node name="Darken" type="ColorRect"]
 anchor_right = 1.0
diff --git a/material_maker/main_window.gd b/material_maker/main_window.gd
index c5e4389eb..1c4d71966 100644
--- a/material_maker/main_window.gd
+++ b/material_maker/main_window.gd
@@ -1189,7 +1189,7 @@ func bug_report() -> void:
 
 func about() -> void:
 	var about_box = preload("res://material_maker/windows/about/about.tscn").instantiate()
-	add_child(about_box)
+	add_dialog(about_box)
 	about_box.hide()
 	about_box.popup_centered()
 
@@ -1431,6 +1431,10 @@ func add_dialog(dialog : Window):
 	if mm_globals.get_config("dialog_dim_background"):
 		add_child(background)
 		dialog.tree_exited.connect(background.queue_free)
+		dialog.tree_exited.connect(func():
+			var tween := get_tree().create_tween()
+			tween.tween_property(background, "modulate:a", 0.0, 0.3).set_trans(Tween.TRANS_CUBIC)
+			tween.tween_callback(background.queue_free))
 	add_child(dialog)
 
 # Accept dialog