app/assets/stylesheets/application.scss
// vendor code
// if using 'jquery-ui*', then it should be required before 'bootstrap*'
@import "jquery-ui/autocomplete";
@import "bootstrap-sprockets";
@import "bootstrap";
@import "bootstrap-multiselect";
@import "font-awesome";
// customized stuff
@import "variables";
@import "mixins";
@import "main";
@import "./*"