price estimate on delivery exceeds border

[MasterAlek]

Hello. Is there anyone who can tell me how to fix this?

As you can see in the picture, the field with "POSTNR" exceeds the border.

Link to picture: https://s20.postimg.org/7ckzi8ul9/price_estimate.png

[OST Agency]

Please share in which page you have this. Or set style of this input box in respected theme css file.