The appearance of the CMSEditModeButtonAdd control is determined by the CSS class it uses.

 

You can use the following CSS class to modify the design of the control:

 

 

The recommended place to define this class is in a stylesheet in the Kentico CMS administration interface at Site Manager -> Development -> CSS stylesheets. These stylesheets can be applied to individual documents (pages) that contain the control in CMS Desk -> Content -> Edit -> Properties -> General -> CSS stylesheet.