adding nodejs express server
prepare for Heroku deployment
set dynamic port for heroku
set dynamic port for heroku
add package version
add viewport
node version
node version
node version
node version
use number input
hide unrounded values on a small viewport
mobile style improvements
mobile style improvements
mobile style improvements
adding google analytics id
update tracking code
switch back to traditional tracking as asynchronous tracking did not work
one last try using asynchronous api
adding icons