Order product list table width

Hello Nicolas... again

This question may seem like i´m bothering you guys up, but i have spent hours trying this to work.
How can i set the order product listing table width to 380 px?

Here is a picture:

On which page ?
Back end invoice, front end invoice, back end order page , front end order page ?

front end order page

You can add the CSS:
#hikashop_order_main #htmlfieldset_products{
width: 380 px;
}
in the CSS of HikaShop via the front end CSS edition interface in the config under the tab Display.