Customizing Basic UI with CSS

Hi there

I created the CSS file and the HTML file. Inside the sitemap, I assume in each site map, i added


sitemap lights label="Lights" {
    Frame label="Exterior Lights" {
      Switch item=NorthEastDrive_Light label="North East Drive" icon="Light"
      Switch item=NorthWestDrive_Light label="North West Drive" icon="Light"
      Switch item=NorthCarPark_Light label="North Car Park" icon="Light"
      Switch item=LaundryEntrance_Light label="Laundry Entrance" icon="Light"
      Switch item=FrontDoor_Light label="Front Door" icon="Light"
      Switch item=EntranceWest_Light label="Entrance West" icon="Light"
      Switch item=WestGarden_Light label="West Garden" icon="Light"
      Switch item=East_Light label="East" icon="Light"
      Switch item=Patio_Light label="Patio" icon="Light"
}
    Frame label="Interior Lights" {
      Switch item=WallPendant_Light label="Wall Pendant" icon="Light"
      Switch item=Bird_Light label="Bird Lights" icon="Light"
      Switch item=Node11_Sw1 label="Empty 1" icon="Light"
      Switch item=Node11_Sw2 label="Empty 2" icon="Light"
}
// Hide default navigation
            Webview url="/static/ihp-theme/HideHeader.html" icon=none
}


But it gives a broken link, icon webview? Does anyone know what im doing wrong.

Thanks