Add REST API reference page CSS class styles

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/resources/static/css/bookstore.css

@@ -3,4 +3,13 @@
 .bookform-section {
 	border-top: 1px dotted #888;
 	padding-top: 1.5em;
+}
+
+.apiref-table-right {
+	width: 50%;
+}
+
+.apiref-table-title {
+	background-color: #48C;
+	color: #FFF;
 }