I have an html page with a 3 column layout done with bootstrap basically like this:
<div name="column1" class="col-md-3">
//column content here
</div>
<div name="column1" class="col-md-6">
//column content here
</div>
<div name="column1" class="col-md-3">
//column content here
</div>
This is just an example, the content inside i don't believe to be relevant to the question. The thins is that when I re-size the page, i want the middle column to remain on top of the page, while the 2 side columns stack beneath it.