Fix featured book title margin & child compile error

assets/styles/components/_book.scss

@@ -48,7 +48,7 @@
     margin: .5rem 0 0;
     font-size: 0.875rem;
     text-align: left;
-    display: box;
+    display: flex;
     overflow: hidden;
     -webkit-line-clamp: 2;
     -webkit-box-orient: vertical;

assets/styles/components/_featured_book.scss

@@ -26,5 +26,6 @@
     justify-content: center;
     align-items: center;
     font-weight: 500;
+    margin-top: 1rem;
   }
 }

dist/styles/aldine.css

@@ -1901,7 +1901,9 @@ nav {
   margin: 0.5rem 0 0;
   font-size: 0.875rem;
   text-align: left;
-  display: box;
+  display: -webkit-box;
+  display: -ms-flexbox;
+  display: flex;
   overflow: hidden;
   -webkit-line-clamp: 2;
   -webkit-box-orient: vertical;
@@ -1978,6 +1980,7 @@ nav {
       -ms-flex-align: center;
           align-items: center;
   font-weight: 500;
+  margin-top: 1rem;
 }
 
 label {

webpack.mix.js

@@ -74,4 +74,7 @@ mix.webpackConfig( {
 			isotope: 'isotope-layout',
 		},
 	},
+	stats: {
+		children: true
+	}
 } );