Thanks for your answer, here’s a direct link : http://pkw2.pierreklein.com, hope it will works for you to see.
I put the custom query in the full screen sidebar as you said but it seems that my pictures get resized even in full-screen mode.
I created a sidebar (“HomepageSlider”) including a widget for which I choose “image gallery” and selected 2 panorama pictures (roughly 4000×1000 each) but they are automatically resized no matter where I put sidebar in…
I’m still unable to modify the content margin and padding.
Thanks again for your help