title: Bootstrap 3 only for mobile
body: <p>I have a site <code>1600px</code> wide and I want to make that fit nicely on mobile only. How can I do with Bootstrap 3. I tried to use <code>col-sm-*</code>. but also effects on larges screens because existing site is not coded as per Bootstrap grid. Is there any way I can use Bootstrap without effecting large screen?</p>