Unknown property errors with CSS file

[Takeshita Shoichiro]

Basic question about CSS file.

The following CSS file is claimed with 9 errors. Only color property is
accepted.  What's the problems?  I'm using VS Code.
And mxml specifies this CSS as follows:

<fx:Style source = "Style.css" />

Thanks for your help in advance.
-----------------------------------------------------------------------------------------------------------------------------

/* CSS file */
@namespace s "library://ns.apache.org/royale/spark";
@namespace mx "library://ns.apache.org/royale/mx";

.heading {
   fontFamily: Arial, Helvetica, sans-serif;
   fontSize: 17px;
   color: #9b1204;
   textDecoration:none;
   fontWeight:normal;
}

.button {
   fontWeight: bold;
}

.container {
   cornerRadius :10;
   horizontalCenter :0;
   borderColor: #777777;
   verticalCenter:0;
   backgroundColor: #efefef;
}

-- 
Shoichiro Takeshita
武下 祥一郎