You would like to use the column offset class. If you use the Bootstrap assembly, all column classes must add up to 12. Only col-lg-offset-2 8 can be added to your col-lg-3 and col-lg-5 , so adding col-lg-offset-2 should fix you to the center. In addition, bootstrap has a built-in container centering class that I personally would use. See below code:
<div class="container"> <div class="row"> <div class="col-lg-3 col-lg-offset-2 gauche"> Left div </div> <div class="col-lg-5 corps"> Right div </div> </div> </div>
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