gk_publisher responsible?

Good morning,
I need the orange box and the owner and reduce text are responsibles
The font size or the orange box is not reduced
How do I do it?
I need you will help me please
I use the style gk_publisher
http://www.lengua.cyangraf.es

Hi,
I suggest to use simple solution :

@media (max-width: 860px) {
.gkIsWrapper-gk_publisher figcaption a { font-size:30px }
.gkIsWrapper-gk_publisher figcaption h2 { line-height: 30px;}
}
@media (max-width: 480px) {
.gkIsWrapper-gk_publisher figcaption a { font-size:20px }
.gkIsWrapper-gk_publisher figcaption h2 { line-height: 20px;}
}

This should help for smartphones and most of tablets.

Thanks for your help
works!!!