Applying CSS to a MultiSelect Grid widget but it does not seem to work at all

I am trying to apply this CSS to a MultiSelect Grid widget but it does not seem to work at all. Any suggestions ?

The CSS given on that old thread you revived was for the regular Matrix Field (not for the Multiselect Grid Widget).

Also, the CSS works as intended too. Here's a test form showing a styled Matrix Field using those codes given by my colleague https://www.jotform.com/70594143344960

Here's the complete snippet again in case you need it http://pastebin.com/raw/UD61B7td

Related guide: How-to-Inject-Custom-CSS-Codes