jquery mobile - remove icon disc in the header

Question

I am using jqm 1.4.5 to create an application but I have a problem about icons. I got remove all the disc from the icons with a class=ui-nodisc-icon but when I get to the header icons the disc does not come out. Someone was able to remove the disc from the icons in the header?

print https://i.postimg.cc/v81SLPZx/2019-02-26-00-10-54.png