Hey Sergey,
Thanks for using Event Tickets! I hope you’re enjoying it so far, despite the issue here with styling.
Do you notice the same issue when using a default WordPress theme? I get a good amount of styling when using Twnety Fifteen (screenshot), so I’m wondering if perhaps the theme you are using is overriding those styles.
Let me know if that appears to be the case when you test a default theme. If you’re still seeing the issue, we can dig deeper from there.
Cheers!
Geoff