[Theme: Earth Pro] Helpppp please !!!!

Hello,
I have installed and try to make adjustment on the theme Earth Pro
it is a very very simple theme but i can’t find a way to take off the blue color that is on a link in my left menu when the page is active ???? and all the sub page ? I try everything, but can’t find where is hiden this option.
see : https://www.a-picture-from-switzerland.com/?page_id=73
it’s even more obvious in the page “focales”

please help !!!