How to use custom css for html file in KM

Hi,

Have created a new HTML file in KM.

would like to use my own css for this....

tried uploading the css file in KM and additing it to the HTML like

<link href="/irj/go/km/docs/wpccontent/CoPT_PWS/site/site/styles/cochin-port.css" rel="stylesheet" type="text/css" />

however this is not working..

Do i have to use repository filters for this..?

Please advise

Thanks,

Rocky