Z-Index issues on Shards Dashboards presentation page

[nickvasdev]

(Originally reported by @rodrigorhas)

Mobile only - hardware and software description

Google Chrome: 65.0.3325.109(Versão oficial) 32 bits
Revision: f412f53af6f3abcd6165b6cf0859dad2e88ff87d-refs/branch-heads/3325@{#626}
SO: Android 6.0.0; LG-K430 Build/MRA58K
JavaScript: V8 6.5.254.28
User Agent: Mozilla/5.0 (Linux; Android 6.0; LG-K430 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.109 Mobile Safari/537.36

Main menu is under section content

Main menu is under select element

Button overflow

Weird behave caused by 2nd issue (select element)