Responsive Header Images ?

I’m not a programmer and I’m new in WordPress.

Work with ‘mindstream’ child theme on Genesis FW.
Need Responsive header images…
SITE: moro-laupen.ch

1.) I added following code to get pictures in header (functions.php):

$args = array(
‘flex-width’ => true,
‘width’ => 960,
‘flex-height’ => true,
‘height’ => 185,
);
add_theme_support( ‘genesis-custom-header’, $args );

– WORKS –

2.) I should have to get DIFFERENT pictures in different chapters
Installed Custom Header Extended PlugIn.
– WORKS, I have different pictures now –

3. PROMLEM – Header pictures are not responsive
Now I searched the whole internet and tried so many examples, in CSS to get the header pictures responsive. No way. I don’t know how to do…

– Wrote directly to J. Tadlock, to help me, sure for payment. – NO REACTION.

– I know, first ask the theme author… I did. Only answer: “..ability to help will be limited since you’re using a third party plugin… Ask the developer of the PlugIn…“

…what a whole string of… a rat’s tail (loop)…

I think it’s only a problem in the CSS and also I think it coldn’t be, I’m the only one with this problem… (Hope so)
> Please, help me!

? Nobody interested to work for a fee ?

https://www.ads-software.com/plugins/custom-header-extended/