Buttons in web-browser are not clickable

[ru-kontrol]

I run PiRTV via nvm exec 6.14.4 node app.js (forcily use 6.14.4, because at other Node i get error ./node_modules/socket.io/lib/transports/websocket/hybi-07-12.js:442
Parser.prototype.proto = EventEmitter.prototype; )

In these conditions, In Opera or Chromium-browser I open http://ip:8080, see icons "Watch", "Listen" and "Play", but it is unable to click on them.

Where is mistake in my case ?