Header: moving the whole page

Hi
I have installed a my shop and have already made some changes and when i try to change the header some text to danish and changing the "sales message goes here" it moves the whole site to the left and make the text size big
try see www.impresa.dk
and if i only change the title "sales message goes here" it do the same. no matter what i do to the header.php file i do it.

what can i do please help.

Sales Message text...font and size are changed via stylesheet of current template being used...look for tagline in stylesheet

Can you please eksplaine more detailed what i have to do in the stylesheet.

it's only when i'm changing the header.php file.