UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/53.0.2785.143 Chrome/53.0.2785.143 Safari/537.36

Example URL:
http://bulma.io/documentation/elements/form/

Steps to reproduce the problem:
1. i dont know
2. 
3. 

What is the expected behavior?

What went wrong?
select box drop down box not showing in properly pleas check it once in mobile version i mean below the 768px in screen

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 53.0.2785.143  Channel: n/a
OS Version: 
Flash Version: