Hi Laurent,
Better without that yellow!
I think your website is lacking a bit of pizazz though. I think it needs some text to really wow me into using your company - perhaps a few case studies, customer testimonials, etc.
The 'About us' section really needs some text rather than relying on people to click the glowing button.
It's pretty unusual to have a Logo on the right of a web page, simply because the place where western readers eyes settle first is the top left hand corner of the page.
Check out your competitors for some content and styling ideas!
Lastly, as a commercial website representing your company, consider (since this represents your company and will be a first port of call for many) whether using a professional designer might be a better use of resources leaving you free to pursue your customers.
Hope that helps (advice from a guy with a single page static website).
Paul
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