Hi Alvaro,
Hope you're fine and not too busy because we still have a very weird behavior with section height size when browser window screen is reduced.
You can reproduce this issue with the demo (FF, Chrome or IE).
- Minimize screen to about 730x750 (or less) - don't use responsive view with firebug, reduce window directly
- Refresh, and you can see a border at the bottom, the following section above (the calculated height section is not 100%)
- If you resize, the height is well calculated
Tell me if you want any screen shot