There is a row with 2 blocks:
<div class="container"> <div class="row"> <div="class="col-lg-6 col-md-12">1</div> <div="class="col-lg-6 col-md-12">2</div> </div> </div> How to do what would be the second block (with the number '2' inside) with a smaller screen, I mean in md size was always on top of the first block.