>Why don't you use Bootstrap? It's much more easy to do this, and allow you to make it work for phones.
>
>Update:
>
>Some examples:
>http://getbootstrap.com/getting-started/#examples
>http://www.tutorialrepublic.com/codelab.php?topic=bootstrap&file=two-column-grid-layouts-for-all-devices
>https://www.w3schools.com/bootstrap/bootstrap_grid_examples.asp

It already works with everything. One adjustment was required at one specific location. It's been resolved yesterday.