Update horizontal_timeline.2.0.css

Author: yCodeTech

css/horizontal_timeline.2.0.css

@@ -10,6 +10,7 @@ Licensed under the MIT license
 Docs at http://horizontal-timeline.ycodetech.co.uk
 
 -------------------------------- */
+html, 
 body {
 	/* Stop horizontal scrollbar from appearing/disappearing when the content slides across and changes.*/
 	overflow-x: hidden;