put thead-light class in for table headings

templates/settings.html

@@ -2,8 +2,8 @@
 		<div class="container">
 			<h3 class="offset-lg-2">{{page_title}}</h3>
 			<div class="row">
-				<table class="table table table-sm col-xl-12">
-				<thead><tr><th>Name</th><th>Value</th></tr></thead><tbody>
+				<table id="settings_tbl" class="table table-sm">
+				<thead><tr class="thead-light"><th>Name</th><th>Value</th></tr></thead><tbody>
 					{% for obj in objects %}
 						<tr><td><a href="{{url_for('setting', id=obj.id)}}">{{obj.name}}</a></td><td>{{obj.value}}</td></tr>
 					{% endfor %}