Bug 1381356 - The onboarding notification button should not wrap r=mossop

MozReview-Commit-ID: L7mMLopZqdl

--HG--
extra : rebase_source : 232d05713ff957e950aedecb7ba0ae9dcc81156e

browser/extensions/onboarding/content/onboarding.css

@@ -536,6 +536,7 @@
   padding: 10px 20px;
   font-size: 14px;
   color: #fff;
+  min-width: 130px;
 }
 
 @media all and (max-width: 960px) {