No PixelStyleValue defined for type String error for Jsdom backend

[doofin]

    import scalatags.JsDom.all._
    import scalatags.JsDom.implicits._

    div(height := "800", width := "500")

gives error

No PixelStyleValue defined for type String; scalatags does not know how to use String as an style
[error]     div(height := "800", width := "500")
[error]                ^

[mathieuleclaire]

height := 500 should work