Add missing CSS styles

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

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

@@ -23,4 +23,13 @@
 #bookstore-loginout {
 	text-align: right;
 	margin: 0.5em 2em;
+}
+
+.checkbox-base {
+	display: flex;
+	/*justify-content: space-between;*/
+}
+
+.checkbox-box {
+	margin-left: 7.5em;
 }