Custom bootstrap.scss for limiting styles to elements within container with .bootstrap-container class.

bootstrap.scss

// Core variables and mixins
@import "bootstrap/variables";
@import "bootstrap/mixins";

@import "bootstrap/print";
@import "bootstrap/glyphicons";

.bootstrap-container {
  // Reset and dependencies
  @import "bootstrap/normalize";

  // Core CSS
  @import "bootstrap/scaffolding";
  @import "bootstrap/type";
  @import "bootstrap/code";
  @import "bootstrap/grid";
  @import "bootstrap/tables";
  @import "bootstrap/forms";
  @import "bootstrap/buttons";

  // Components
  @import "bootstrap/component-animations";
  @import "bootstrap/dropdowns";
  @import "bootstrap/button-groups";
  @import "bootstrap/input-groups";
  @import "bootstrap/navs";
  @import "bootstrap/navbar";
  @import "bootstrap/breadcrumbs";
  @import "bootstrap/pagination";
  @import "bootstrap/pager";
  @import "bootstrap/labels";
  @import "bootstrap/badges";
  @import "bootstrap/jumbotron";
  @import "bootstrap/thumbnails";
  @import "bootstrap/alerts";
  @import "bootstrap/progress-bars";
  @import "bootstrap/media";
  @import "bootstrap/list-group";
  @import "bootstrap/panels";
  @import "bootstrap/responsive-embed";
  @import "bootstrap/wells";
  @import "bootstrap/close";

  // Components w/ JavaScript
  @import "bootstrap/tooltip";
  @import "bootstrap/popovers";
  @import "bootstrap/carousel";

  // Utility classes
  @import "bootstrap/utilities";
  @import "bootstrap/responsive-utilities";
}

// Excluded to allow modal-backdrop to work.
@import "bootstrap/modals";