diff --git a/themes/base/ui.slider.css b/themes/base/ui.slider.css
index 6b76d19a0..2478da188 100644
--- a/themes/base/ui.slider.css
+++ b/themes/base/ui.slider.css
@@ -10,4 +10,4 @@
 
 .ui-slider-vertical { width: .8em; height: 100%; }
 .ui-slider-vertical .ui-slider-handle { left: -.3em; margin-left: 0; margin-bottom: -.6em; }
-.ui-slider-vertical .ui-slider-range { position: relative; left: 0; height: auto; width: 100%; }
\ No newline at end of file
+.ui-slider-vertical .ui-slider-range { left: 0; height: auto; width: 100%; }
\ No newline at end of file