iframe: fix positioning on website

footer and headlines got sliced of a bit and there was a grey
line on the right


Headlines:
![bildschirmfoto 2014-09-18 um 20 51 00](https://cloud.githubusercontent.com/assets/298166/4325388/c64e9ed6-3f64-11e4-84a1-968f21aef3d1.png)

Grey line on the right:
![bildschirmfoto 2014-09-18 um 18 06 59](https://cloud.githubusercontent.com/assets/298166/4325370/95bf80e6-3f64-11e4-98c3-285abd8230d0.png)

Footer:
![bildschirmfoto 2014-09-18 um 18 06 53](https://cloud.githubusercontent.com/assets/298166/4325371/972f9f1a-3f64-11e4-925d-9d620294b11b.png)