no more backdrop filter

src/styles/_mixins.scss

@@ -109,6 +109,11 @@
 }
 
 @mixin can_backdrop {
+  @supports ((bla-bla-bla: 4px)) {
+    @content;
+  }
+  // uncomment if you like blur performance again :-)
+  /*
   @supports (
     (-webkit-backdrop-filter: blur(5px)) or (backdrop-filter: blur(5px))
   ) {
@@ -123,6 +128,7 @@
       }
     }
   }
+  */
 }
 
 @mixin blur($color: $content_bg_backdrop, $radius: 15px) {

src/styles/themes/_default.scss

@@ -63,7 +63,7 @@ $_brown: #23201f;
     --content_bg_success: #{transparentize($_wisegreen, 0.7)};
     --content_bg_info: #{transparentize($_blue, 0.5)};
     --content_bg_danger: #{transparentize($_red, 0.5)};
-    --content_bg_backdrop: #{transparentize($_brown, 0.2)};
+    --content_bg_backdrop: #{transparentize($_brown, 0.05)};
 
     // white shades (move to --vars)
     --white: white;