Floats
Overview
Use a float to pull an element out of the document’s normal flow and to align it with the left or right side of the container.
Classes
These utility classes float an element to the left .pull-left or right .pull-right, or disable floating .pull-none.
Clearfix
Clear floats by adding the .clearfix to the parent element. Without the clearfix the wrapping div would not span around the floated elements and cause a broken layout.