Sydney Slideshow header responsivity

Hello,
I have an issue with the responsivity of my header (It’s a slideshow).

Desktop : https://ibb.co/2kPHDb6
Mobile : https://ibb.co/L9Kkq29

On desktop, it’s perfect.
On mobile, i have only a half background image.
I tried to change the customize CSS but no success.

Thanks for your help !