gistfile1.css

#editorviewbox #tabbed-view tabs
background: pink !important;
    height: 70px !important;
    overflow: hidden;
    
}
#editorviewbox #tabbed-view tabs > tab {
  height: 25px !important;
  max-height: 25px !important;
  max-width:130px !important;
}
tab:hover,
tab[selected="true"] {
  max-width: 250px !important;
  border-top-width: 1px;
}