title: Website sticks out of the window on mobile
body: <p>it's been few hours that I am looking for the answer to my problem and I am starting to desesperate. I hope you could help me ! 
  I am developping a personal website and I am working on the responsive. I don't know why, but on mobile, I can horizontally scroll, the body (or whatever this is) sticks out of the window. I've tried to place some <code>box-sizing : border-box</code> because I thought it would resolve it then I check 2x times my entirely code, trying to delete or add some elements but still no good result. </p>
  
  <p>Given that I don't know where the problem is, I think it is easier if I provide you the url : <a href="http://nicolas-werner.com" rel="nofollow noreferrer">right here</a>. (Use the web developer mode of your browser to see the website on a mobile way so you can see my problem) </p>
  
  <p>Hope you can help me, I haven't any other idea of what to do...</p>
  
  <p>Thanks !</p>