sample_rails_tailwind/app/assets/stylesheets/application.scss

/*
 * This is a manifest file that'll be compiled into application.css.
 *
 * With Propshaft, assets are served efficiently without preprocessing steps. You can still include
 * application-wide styles in this file, but keep in mind that CSS precedence will follow the standard
 * cascading order, meaning styles declared later in the document or manifest will override earlier ones,
 * depending on specificity.
 *
 * Consider organizing styles into separate files for maintainability.
 * 把 app/assets/stylesheets 目录中的所有 CSS 文件(包含子目录中的文件)都引入应用的 CSS 文件
 *= require_tree .
 * 把当前文件中的 CSS 也加载进来。
 *= require_self
 */

@import "bootstrap-sprockets";
@import "bootstrap";