fixes #352 safari hack: focusing input w/ 0 height

Author: shawncplus

paper-input-container.html

@@ -237,6 +237,8 @@
         transition: transform 0.25s, width 0.25s;
         -webkit-transform-origin: left top;
         transform-origin: left top;
+        /* Fix for safari not focusing 0-height date/time inputs with -webkit-apperance: none; */
+        min-height: 1px;
 
         @apply --paper-font-common-nowrap;
         @apply --paper-font-subhead;