diff --git a/headroom/headroom.css b/headroom/headroom.css
index 4122d683..29232342 100644
--- a/headroom/headroom.css
+++ b/headroom/headroom.css
@@ -1,5 +1,6 @@
 .headroom {
     transition: transform 140ms ease-out;
+    will-change: transform;
 }
 
 .headroom--pinned {
diff --git a/themes/black/theme.css b/themes/black/theme.css
index 62257c02..872c1028 100644
--- a/themes/black/theme.css
+++ b/themes/black/theme.css
@@ -49,7 +49,7 @@ html, .dialog, .backgroundContainer {
 }
 
     .backgroundContainer.withBackdrop {
-        background-color: rgba(0,0,0,.84);
+        background-color: rgba(0,0,0,.83);
     }
 
 /* buttons */
diff --git a/themes/dark-red/theme.css b/themes/dark-red/theme.css
index fc860f31..ed14e263 100644
--- a/themes/dark-red/theme.css
+++ b/themes/dark-red/theme.css
@@ -49,7 +49,7 @@ html, .dialog, .backgroundContainer {
 }
 
     .backgroundContainer.withBackdrop {
-        background-color: rgba(0,0,0,.84);
+        background-color: rgba(0,0,0,.83);
     }
 
 /* buttons */
diff --git a/themes/dark/theme.css b/themes/dark/theme.css
index b62bee0d..54953f9f 100644
--- a/themes/dark/theme.css
+++ b/themes/dark/theme.css
@@ -49,7 +49,7 @@ html, .dialog, .backgroundContainer {
 }
 
     .backgroundContainer.withBackdrop {
-        background-color: rgba(0,0,0,.84);
+        background-color: rgba(0,0,0,.83);
     }
 
 /* buttons */
diff --git a/themes/halloween/theme.css b/themes/halloween/theme.css
index acb18a35..2851bd1a 100644
--- a/themes/halloween/theme.css
+++ b/themes/halloween/theme.css
@@ -65,7 +65,7 @@ html, .dialog, .backgroundContainer {
 }
 
     .backgroundContainer.withBackdrop {
-        background-color: rgba(0,0,0,.84);
+        background-color: rgba(0,0,0,.83);
     }
 
 /*@supports ( (backdrop-filter: blur(1em))) {
diff --git a/themes/holiday/theme.css b/themes/holiday/theme.css
index 6e889361..f1443c98 100644
--- a/themes/holiday/theme.css
+++ b/themes/holiday/theme.css
@@ -49,7 +49,7 @@ html, .dialog, .backgroundContainer {
 }
 
     .backgroundContainer.withBackdrop {
-        background-color: rgba(0,0,0,.84);
+        background-color: rgba(0,0,0,.83);
     }
 
 /* buttons */