This is website mockup of ConceptDraw.com user registration form web page. [https://my.conceptdraw.com/account/downloads.php]
It use 960 Grid System 16-column grid page layout design pattern.
"The 960 Grid System is an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels. There are two variants: 12 and 16 columns, which can be used separately or in tandem. ...
The 16-column grid consists of 40 pixel increments. Each column has 10 pixels of margin on the left and right, which create 20 pixel wide gutters between columns." [http://960.gs/]
The example "User registration form" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Website Mockup solution from the Software Development area of ConceptDraw Solution Park.