diff --git a/themes/compact.css b/themes/compact.css
index ccd6ef76c..d462892db 100644
--- a/themes/compact.css
+++ b/themes/compact.css
@@ -1475,8 +1475,7 @@ body.ttrss_utility hr {
   box-shadow: 0 1px 1px -1px rgba(0, 0, 0, 0.1);
   border: 0 solid #ddd;
   border-bottom-width: 1px;
-  background: white ! important;
-  opacity: 0.9;
+  background: rgba(255, 255, 255, 0.9) ! important;
   backdrop-filter: blur(6px);
 }
 body.ttrss_prefs {
diff --git a/themes/compact_night.css b/themes/compact_night.css
index 6b072e510..8b1cd17bc 100644
--- a/themes/compact_night.css
+++ b/themes/compact_night.css
@@ -1475,8 +1475,7 @@ body.ttrss_utility hr {
   box-shadow: 0 1px 1px -1px rgba(0, 0, 0, 0.1);
   border: 0 solid #222;
   border-bottom-width: 1px;
-  background: #333 ! important;
-  opacity: 0.9;
+  background: rgba(51, 51, 51, 0.9) ! important;
   backdrop-filter: blur(6px);
 }
 body.ttrss_prefs {
diff --git a/themes/light-high-contrast.css b/themes/light-high-contrast.css
index 18fc67f6a..77f3def7e 100644
--- a/themes/light-high-contrast.css
+++ b/themes/light-high-contrast.css
@@ -1475,8 +1475,7 @@ body.ttrss_utility hr {
   box-shadow: 0 1px 1px -1px rgba(0, 0, 0, 0.1);
   border: 0 solid #ddd;
   border-bottom-width: 1px;
-  background: white ! important;
-  opacity: 0.9;
+  background: rgba(255, 255, 255, 0.9) ! important;
   backdrop-filter: blur(6px);
 }
 body.ttrss_prefs {
diff --git a/themes/light.css b/themes/light.css
index 475e4dbbf..8367b07cc 100644
--- a/themes/light.css
+++ b/themes/light.css
@@ -1475,8 +1475,7 @@ body.ttrss_utility hr {
   box-shadow: 0 1px 1px -1px rgba(0, 0, 0, 0.1);
   border: 0 solid #ddd;
   border-bottom-width: 1px;
-  background: white ! important;
-  opacity: 0.9;
+  background: rgba(255, 255, 255, 0.9) ! important;
   backdrop-filter: blur(6px);
 }
 body.ttrss_prefs {
diff --git a/themes/light/cdm.less b/themes/light/cdm.less
index 4cbfa1d28..6bb3378c1 100644
--- a/themes/light/cdm.less
+++ b/themes/light/cdm.less
@@ -325,8 +325,7 @@
 			box-shadow : 0 1px 1px -1px rgba(0,0,0,0.1);
 			border: 0 solid @border-default;
 			border-bottom-width: 1px;
-			background : @default-bg ! important;
-			opacity: 0.9;
+			background : fade(@default-bg, 90%) ! important;
 			backdrop-filter: blur(6px);
 		}
 	}
diff --git a/themes/night.css b/themes/night.css
index 24288e149..447ca6f7f 100644
--- a/themes/night.css
+++ b/themes/night.css
@@ -1476,8 +1476,7 @@ body.ttrss_utility hr {
   box-shadow: 0 1px 1px -1px rgba(0, 0, 0, 0.1);
   border: 0 solid #222;
   border-bottom-width: 1px;
-  background: #333 ! important;
-  opacity: 0.9;
+  background: rgba(51, 51, 51, 0.9) ! important;
   backdrop-filter: blur(6px);
 }
 body.ttrss_prefs {
diff --git a/themes/night_blue.css b/themes/night_blue.css
index 209484935..7a6ce2b69 100644
--- a/themes/night_blue.css
+++ b/themes/night_blue.css
@@ -1476,8 +1476,7 @@ body.ttrss_utility hr {
   box-shadow: 0 1px 1px -1px rgba(0, 0, 0, 0.1);
   border: 0 solid #222;
   border-bottom-width: 1px;
-  background: #333 ! important;
-  opacity: 0.9;
+  background: rgba(51, 51, 51, 0.9) ! important;
   backdrop-filter: blur(6px);
 }
 body.ttrss_prefs {