[css-color] Remove prefixes from styling.

--HG--
extra : rebase_source : 4d67543bb43ba0d27e953e7641ea176c0c79e4ce

Author: tabatkins

css-color/Overview.bs

@@ -22,14 +22,8 @@ table.named-color-table td:nth-child(n+4) { background: silver; }
 .color-table {
 	background: #808080;
 	display: block;
-	display: -webkit-flex;
-	display: -moz-flex;
 	display: flex;
-	-webkit-flex-flow: row wrap;
-	-moz-flex-flow: row wrap;
 	flex-flow: row wrap;
-	-webkit-justify-content: space-around;
-	-moz-justify-content: space-around;
 	justify-content: space-around;
 }
 .color-table table { padding:1em; margin:0; float:left; }