Fix styling that could have coused clock to disappear

wojtekmaj · wojtekmaj · commit e68d5c0d282a · 2017-12-17T01:06:01.000+01:00
diff --git a/src/Clock.css b/src/Clock.css
@@ -1,4 +1,5 @@
 .react-clock {
+  display: block;
   position: relative;
 }
 .react-clock,
