Remove surplus CSS declarations for secondary axis

pygal/css/graph.css

@@ -49,12 +49,8 @@ text.no_data {
 .axis.y text {
   text-anchor: end;
 }
-.axis.2y text {
-  text-anchor: start;
-}
 
-.axis.y .logarithmic text:not(.major) ,
-.axis.2y .logarithmic text:not(.major) {
+.axis.y .logarithmic text:not(.major) {
   font-size: 50%;
 }
 
@@ -70,13 +66,11 @@ text.no_data {
 }
 
 .horizontal .axis.y .guide.line,
-.horizontal .axis.2y .guide.line,
 .vertical .axis.x .guide.line {
   opacity: 0;
 }
 
 .axis.y .guides:hover .guide.line,
-.axis.2y .guides:hover .guide.line,
 .line-graph .axis.x .guides:hover .guide.line,
 .gauge-graph .axis.x .guides:hover .guide.line,
 .stackedline-graph .axis.x .guides:hover .guide.line,