Position is not a know CSS property name

[Viper5646]

Hi allI'm using Visual Web Developer 2010 Express.Does anyone know why it tells me that Position is not a known CSS property name.Or how I can fix this.Thanks in advance.Here is my code.

 div{ 	border: thin groove #000000;	padding: 4px;	margin: auto;	background-color: red;	height: 75px;	position: relative;	display: none; }

[Ingolme]

It seems that the editor isn't working properly. Position is just fine, ignore their warnings and use it if you need to.

[Viper5646]

thanks Igolme for your help.It also works better if I change from HTML to XHTML Transition.

[chibineku]

Everyone here will advise using a strict doctype, not transitional, as it gets the most consistent results.