ruby on rails - Invalid CSS after "...kground-color: ": expected expression (e.g. 1px, bold), was "@gray-lightest;" -


hello learning rails, getting error message in new project,

invalid css after "...kground-color: ": expected expression (e.g. 1px, bold), "@gray-lightest;"

here application.scss

/*  * manifest file that'll compiled application.css, include files  * listed below.  *  * css , scss file within directory, lib/assets/stylesheets, or plugin's  * vendor/assets/stylesheets directory can referenced here using relative path.  *  * you're free add application-wide styles file , they'll appear @ bottom of  * compiled file styles add here take precedence on styles defined in other css/scss  * files in directory. styles in file should added after last require_* statement.  * better create new file per style scope.  *  */    @import "bootstrap-sprockets";  @import "bootstrap";  @import "home.scss"

then have home.scss

 @gray-lightest: lighten(#000, 97.25%);   body {      background-color: @gray-lightest;  }

and have in gemfile

gem 'sass-rails',  '5.0.6' gem 'bootstrap-sass', '3.3.7' gem 'jquery-rails', '4.3.1' gem 'haml-rails'

i have seen sass solutions want use scss or css. i've tried updating bundler , gems. other projects doing fine. have done wrong time? why getting error? .scss extension not working? help.

scss support syntax set variable:

$gray-lightest: lighten(#000, 97.25%);  body {      background-color: $gray-lightest; }

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