feat: Adapt new hippie styles

- Use bound io class
- Remove over specified styles

source/screens/demo/examples/ui/drag.njk

@@ -22,8 +22,10 @@ tags:
 {% endblock %}
 
 {% block body %}
+  <header class="io pos_fix pin_top pin_right pin_left">
+    <button data-action="add">Add</button>
+  </header>
   <div id="space"></div>
-  <button data-action="add">Add</button>
 {% endblock %}
 
 {%- block script %}