Header Image not responsible on mobile

Hi everyone ! I installed the Catch Vogue on my new site with WordPress and I really like it. From pc everything goes ok but from mobile and tablet, the header image stays in the same size and do not adpat to the new device's size. On the other hand, the home page, articles and pages are responsible... My website is https://lsostudio.com. Thank in advance for all your advice. Regards, Caroline