Fix for #303.

Author: brianreavis

src/less/selectize.less

@@ -259,7 +259,7 @@
 		position: absolute;
 		top: 50%;
 		right: @selectize-arrow-offset;
-		margin-top: round(-@selectize-arrow-size / 2);
+		margin-top: round(-1 * @selectize-arrow-size / 2);
 		width: 0;
 		height: 0;
 		border-style: solid;