add the alert for a message

templates/authors.html

@@ -1,7 +1,13 @@
 {% extends "base.html" %}
 
 {% block main_content %}
-<h3>Authors</h3>
+<h3>Show All Authors</h3>
+{% if message|length %}
+	<div class="row alert alert-{{alert}}">
+	{{message}}
+	{{ ClearStatus() }}
+	</div>
+{% endif %}
 <table id="book_table" class="table table-striped table-sm" data-toolbar="#toolbar" data-search="true">
 	<thead>
 		<tr class="thead-light"><th>Surname</th><th>Firstname(s)</th></tr>