What's the background image used by data-theme="b"

1. <div data-theme="b" data-role="header">
           <a data-role="button" href="@Url.Content("~/Holiday")">Back</a>
   
           <h4>Gestion congés
                  
           </h4>
   
       </div>
   
   
   
   
   
   
   

What's the background-image used by this header ? What's the code of this background ?

I researched but I haven't found.

Thank you

• Topic Participants

• bagno_laurent

• zeromancerx

• jtara-jquery