[gnome-builder] style-schemes: fix adwaita dark map overlay

[Christian Hergert <chergert src gnome org>]

commit fdddc12d1e02eb43b88b1c70e981e49c34c110fb
Author: Christian Hergert <chergert redhat com>
Date:   Tue Oct 12 17:30:21 2021 -0700

    style-schemes: fix adwaita dark map overlay

 data/style-schemes/Adwaita-dark.style-scheme.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/style-schemes/Adwaita-dark.style-scheme.xml 
b/data/style-schemes/Adwaita-dark.style-scheme.xml
index db6938792..e538d9774 100644
--- a/data/style-schemes/Adwaita-dark.style-scheme.xml
+++ b/data/style-schemes/Adwaita-dark.style-scheme.xml
@@ -70,7 +70,7 @@
 
   <!-- Global Settings -->
   <style name="text"                        foreground="light4" background="content_bg"/>
-  <style name="map-overlay"                 background="dark1"/>
+  <style name="map-overlay"                 background="#rgba(47,46,48,.3)"/>
   <style name="cursor"                      foreground="light4"/>
   <style name="line-numbers"                foreground="content_alt" background="content_bg"/>
   <style name="current-line"                background="#222"/>