diff --git a/themes/base/ui.tabs.css b/themes/base/ui.tabs.css
index a16e3e046..3ca6b9a0a 100644
--- a/themes/base/ui.tabs.css
+++ b/themes/base/ui.tabs.css
@@ -4,7 +4,7 @@
 .ui-tabs .ui-tabs-nav { list-style: none; position: relative; padding: .2em .2em 0; }
 .ui-tabs .ui-tabs-nav li { position: relative; float: left; border-bottom-width: 0 !important; margin: 0 .2em -1px 0; padding: 0; }
 .ui-tabs .ui-tabs-nav li a { float: left; text-decoration: none; padding: .5em 1em; }
-.ui-tabs .ui-tabs-nav li.ui-tabs-selected { padding-bottom: .1em; border-bottom-width: 0; }
+.ui-tabs .ui-tabs-nav li.ui-tabs-selected { padding-bottom: 1px; border-bottom-width: 0; }
 .ui-tabs .ui-tabs-nav li.ui-tabs-selected a, .ui-tabs .ui-tabs-nav li.ui-state-disabled a, .ui-tabs .ui-tabs-nav li.ui-state-processing a { cursor: text; }
 .ui-tabs .ui-tabs-nav li a, .ui-tabs.ui-tabs-collapsible .ui-tabs-nav li.ui-tabs-selected a { cursor: pointer; } /* first selector in group seems obsolete, but required to overcome bug in Opera applying cursor: text overall if defined elsewhere... */
 .ui-tabs .ui-tabs-panel { padding: 1em 1.4em; display: block; border-width: 0; background: none; }