Hello I put

.ow_header_pic
{
height:150px
}

In every css file in astoria and Astoria

and regullay css when i make changes in ow, css file name change in /ow_userfiles/theme/xxxxxxx.css

and every time the css code change for this :

.ow_header_pic
{
height:316px
}

Somebody can give me a solution to fix this ? I don't want to change header size every time I register a new modification !