My blog

Neat Image on top ??
On firefox, the menu section is shorter than the entries section, and that looks kind of strange.
Neat blog, I would say ??

Thank you 2fargon ??

Nice site. Might I suggest a few things?
Change the .content and #menu elements.
Change the margin for the .content to all pixel format instead of using a mixed px/em format Subtract 200px from the right margin (the 12em). Add 200px to the right padding.
Voila. Now it appears more uniform, instead of the menu ending when it’s finished.

Thank you mark, I modified it is good now ??
https://sukum.org/

(in MSIE at least) The left margin for the content should be a bit bigger : the text appears right next to the black border. Assez joli sinon.

(still in MSIE at least) the Comments page looks wrong : the right col gets displayed under the main block

Thank you all.
The problem is almost regulated, but that does not go under mozilla, under MSIE it goes well, somebody has an idea of the problem ?
https://sukum.org/
Still thank you for your assistance.
Sorry my english is very bad.

Dan Cederholm (simplebits.com) uses the float left for content and wrote this column https://www.alistapart.com/articles/fauxcolumns/ about how to achieve the page background or column background to be the same whether one column or the other is longest. Basically it boils down to your #rap having the same background color (in your case since you are using the same color behind the column and the content areas.)
Kevin
BTW, no need for apologies for language, my French is non-existant! ??

Well we know what the French are like! Cool graphic !!!
Your layout problem is more complicated than it seems. Put simply some variants of IE misinterpret the width to include the border, padding and margins.
If you want to float and many of us do because it is css 1 then there is a whole host of workaround choices. My preferred choice is to have an inner div inside the menu. Good luck. Et bon chance mon ami.

All seems ok, now.
I thank everyone which my helped.
Thank you for your opinions and your assistance !
Thank you phpNeophyte ??

Happy to help.
Kevin