Why I can't edit the margin of the boxes I create by visual composer?

Good morning! 🙂

I have a little problem in pages I create. I can’t understand why if I put the text in two columns, sometimes dont have margins. It’s the case of the page: http://www.nolycarbonell.com/avis-legal/.
And the other problem is that the left column dont align with the general structure of the web. It starts a few pixels in the left: http://www.nolycarbonell.com/politica-de-cookies/
Here I attached the image about what I am trying to explain to you:
http://www.pixhoster.info/f/2016-08/f538e729aa465fae35ac182b03e90d1b.jpg

Thanks!! 🙂

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