set min-width on the theme switch so it doesn't get squished

Author: dylemma

scaladoc/resources/dotty_res/styles/scalastyle.css

@@ -570,6 +570,7 @@ footer .pull-right {
   position: relative;
   display: inline-block;
   width: 60px;
+  min-width: 60px;
   height: 34px;
   margin-bottom: 0;
 }