SharePoint ribbon displays border cant remove

I am trying to display:none on my sharepoint ribbon

s4-ribbonrow

{ display:none; }

The ribbon dont get displayed when i do a print preview but the border of the s4-ribbonrow displays why? I have tried like this

s4-ribbonrow

{ display:none; border:none; } and also

s4-ribbonrow

{ display:none; border-width:0px; } it still displays the top border of the ribbon why?