I cannot tell with absolute certainty, but it looks like the very first photo is a bit too wide for the blog. Does the sidebar re-appear if you (temporarily) remove the pic?

Good luck

You have 2 html errors in your skin, one of which is an unclosed div ;)

v

Edit the first post "Habiter la nature, une obsession contemporaine". The image is embedded wrong.

And you should edit color in here. ;)

http://webolov.free.fr/blogolov/blogs/skins/crystal_glass/stylesheet.css

h1, h1 a, h1 a:hover, h1 a:visited {
text-decoration : none;
color : blake;
}

.description {
font-size : 1.2em;
text-align : center;
color : blake;
}

Problem solved!
You were right, there was an unclosed div hanging around in that last post.
Thank you very much all of you !

@Sam, ain't my colours nice? :'( :)

Cheers,
O.

black is better than blake