Banner image size / container too small?

Hello,

first of all thank you for the JobScout theme! I’m currently testing it and it works very well with the WP Job manager plugin, but I ran into an issue with the banner image:

When displayed on a 4K-screen in a full screen browser (MS Edge) it doesn’t adjust to full screen-width; the image is aligned left and there’s a about 15% of the width of white space on the right side. I already tried other image sizes (high resolution) and height / width-ratios, but nothing helps :-/

Any ideas what might be the reason for this and how to get the banner image go to full screen / browser width?

Thank you!

The page I need help with: [log in to see the link]