Add some separation between the directives on the demo page

Author: g1eb

index.html

@@ -22,9 +22,17 @@
   <h1>Date</h1>
   <date-input date="now" on-change="print(now)" placeholder="Click Me"></date-input>
 
+  <br />
+  <br />
+  <br />
+
   <h1>Time</h1>
   <time-input time="now" on-change="print(now)" placeholder="Click Me"></time-input>
 
+  <br />
+  <br />
+  <br />
+
   <h1>Datetime</h1>
   <datetime-input datetime="now" on-change="print(now)" placeholder="Click Me"></datetime-input>