Change cursor to pointer style for the close button for each menu entry.
Change UI by hiding every topic and leave visible only the one that the user has chosen.
Add site slogan to the header;
Add blue background to each section title;
Add a black box-shadow to each section title;
Change list item style to icon-ok (FontAwesome) and also change the icon to remove a custom topic from icon-remove-sign to icon-remove.
Remove library jQuery Waypoints and its usages because now I'm only have got one section visible at time.