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Bootstrap 3 grid system explained – Zen Invader
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Bootstrap 3 grid system explained – Zen Invader
css - Why does col-sm-12 add a margin that col-sm does not in bootstrap? - Stack Overflow
Bootstrap Grid System
html - How do I display first four records with col-12 and reset records will display in something like col-8(col-6 and col-6) - Stack Overflow
