Correcting typo in markup

src/app/app.component.html

@@ -20,7 +20,7 @@
 		</span>
 	</form>
 	-->
-	<div calss="row">
+	<div class="row">
 		<div class="col-12 pt-4 pb-4">
 			<json-formatter [data]="form.value" open="4"></json-formatter>
 		</div>