Fix backdrop size changing on mobile

src/components/backdrop/backdrop.scss

@@ -1,5 +1,11 @@
 .backdropContainer {
     contain: layout style size;
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    height: 100vh;
+    z-index: -1;
 }
 
 .backdropImage {

src/styles/librarybrowser.scss

@@ -441,15 +441,6 @@
     }
 }
 
-.backdropContainer {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    bottom: 0;
-    z-index: -1;
-}
-
 .libraryPage .header {
     padding-bottom: 0;
 }