I'm starting with Bootstrap and everything seems correct when I check the responsiveness with my desktop browser, but when I go on my phone (Iphone 6) it doesn't give me what I'm expecting...

Here are some screenshots :
Desktop (reduced to preview a mobile browser size)
![enter image description here](https://i.stack.imgur.com/17nc3.jpg)

Phone (Iphone 6)
![enter image description here](https://i.stack.imgur.com/BUb63.jpg)

We can clearly see that there are some trouble... I might have missed something.

You can inspect my code at this url : <http://robeen.fr/v3>

Some help would be much appreciated : )