milo: fix running steps

appengine/cmd/milo/frontend/static/buildbot/css/default.css

Index: appengine/cmd/milo/frontend/static/buildbot/css/default.css
diff --git a/appengine/cmd/milo/frontend/static/buildbot/css/default.css b/appengine/cmd/milo/frontend/static/buildbot/css/default.css
index 517d517ee0a372a06ce5a36e8086efce88e409b5..11d50661bd35c8a7ce6dfc48edf7e8af51079f54 100644
--- a/appengine/cmd/milo/frontend/static/buildbot/css/default.css
+++ b/appengine/cmd/milo/frontend/static/buildbot/css/default.css
@@ -430,6 +430,12 @@ div.BuildWaterfall {
   border-color: #A77272;
 }
 
+.status-Running {
+  color: #000;
+  background-color: #fd3;

[estaab, 2016/06/16 20:13:45]

#fff6c6 as per buildbot?

[Ryan Tseng, 2016/06/16 20:22:37]

old (our version) buildbot uses fff6c6, new(er) versions of buildbot uses fd3. 
I'm impartial to which one we use, but I think i stole^W borrowed this
default.css from the most recent version of buildbot.

+  border-color: #C5C56D;
+}
+
 .status-Warnings {
   color: #FFFFFF;
   background-color: #fa3;