How to add @import at the end of the application.css file?

[jitendravyas]

I'm using this plugin in a Rails project. I added this gem into my Gemfile and downloaded and then imported a CSS files at the end of my main.css like below.

@import "overlay";
@import "responsive/sticky_notes";
@import "responsive/campaign_listing";
@import "responsive/pop_up";
@import "responsive/ribbon";
@import "CSS:bootstrap-tabdrop/build/css/bootstrap-tabdrop.css";

Output I'm getting is this at top

@import url(CSS:bootstrap-tabdrop/build/css/bootstrap-tabdrop.css);

How to move it to bottom?