Header Callout not responsive


The Header Callout (the grey header) is not responsive as it can only include a whole image.

I would like to have my logo center on a orange background (https://wonderguinguette.com/blog/). But the thing is that on smaller screen the image center align on the width and the logo stay on the right.

Do you know how I can arrange that ?

PS: I’m not familiar with Child Theme.

Many thanks for your help.

See a screen shot.