All the Word Press templates starting from the #15327 are coded in a new CSS scheme.
This new style has less coding and is rather simple. It is no longer in need to have a separate stylesheet for IE which means one way of coding for all the browsers. As of today, the templates have a better look in Adobe® Dreamweaver® software.
A separate stylesheet file (layout.css) contains only the sizes of the main blocks and styles of their positions. This will allow customers to easily swap the blocks and their sizes, opposite to searching through the main styles file.
It is more of thorough layout for the styles file that now uses the unique ID for both the blocks and pages. The inheritance allows to create less classes and give them better names to remember.