What's the best way to fix column width ?

Hi,

I'm having trouble to fix width's column for small/or large screen ?

How are you guys doing ?

For example, my last column, each row has 3 buttons like this :

<div class="row">
   <div class="col-lg-4">
       <button type="button" class="btn btn-info"><span class="glyphicon glyphicon-whatever"></span></button>
   </div>
   <div class="col-lg-4">
       <button type="button" class="btn btn-info"><span class="glyphicon glyphicon-whatever"></span></button>
   </div>
   <div class="col-lg-4">
       <button type="button" class="btn btn-info"><span class="glyphicon glyphicon-whatever"></span></button>
   </div>
</div>

And If I set this column to 16%, in large screen it's perfect, but if I switch to smaller screen, last button is out of the column...

Thanks !