overide itembackrop class backgroud-size cover to contain hide on desktop person backdrop

src/assets/css/librarybrowser.css

@@ -387,6 +387,10 @@
     position: relative
 }
 
+.personBackdrop {
+    background-size: contain;
+}
+
 .itemBackdropProgressBar {
     position: absolute !important;
     bottom: 0;
@@ -671,6 +675,10 @@
         display: none !important
     }
 
+    .personBackdropimg-hideondesktop {
+        display: none !important;
+    }
+
     .mainDetailButtons {
         font-size: 108%;
         margin: 1.25em 0