Bookshelf cover size setting and widget

client/assets/app.css

@@ -67,6 +67,14 @@
   font-size: 1.1rem;
 }
 
-#ab-page-wrapper {
+#page-wrapper {
   background-image: linear-gradient(to right bottom, #2e2e2e, #303030, #313131, #333333, #353535, #343434, #323232, #313131, #2c2c2c, #282828, #232323, #1f1f1f);
+}
+
+.box-shadow-md {
+  box-shadow: 2px 8px 6px #111111aa;
+}
+
+.box-shadow-xl {
+  box-shadow: 2px 14px 8px #111111aa;
 }