typo

Author: svgeesus

css-color-4/Overview.bs

@@ -1592,7 +1592,7 @@ Converting HWB colors to sRGB colors</h3>
 	The following Javascript implementation
 	leaves white and black
 	in the range [0,1]
-	rather thn converting them to [0.0%,100.0%].
+	rather than converting them to [0.0%,100.0%].
 
 <pre class="lang-javascript">
 	function rgbToHwb(red, green, blue) {