fix: Some forms on the new 'Form Elements' page don't lay out neatly … (#2444)

Co-authored-by: Paweł Kuna <1282324+codecalm@users.noreply.github.com>

shared/includes/cards/form/layout.html

@@ -1,5 +1,5 @@
 {% assign horizontal = include.horizontal | default: false %}
-<form class="card">
+<form class="card h-100">
 	<div class="card-header">
 		<h3 class="card-title">{{ include.title | default: 'Basic form' }}</h3>
 	</div>
@@ -64,6 +64,9 @@
 				</label>
 			</div>
 		</div>
+		
+	</div>
+	<div class="card-footer">
 		<div class="text-end">
 			<button type="submit" class="btn btn-primary">Submit</button>
 		</div>