two-col-rtl.css 

/* Large resolutions (desktop, tablets in landscape, ...) */
@media only screen and (min-width: 59em) {
  .layout-two-col .layout-region {
    float: right;
  }
}

File

drupal/core/modules/layout/layouts/static/twocol/two-col-rtl.css
View source
  1. /* Large resolutions (desktop, tablets in landscape, ...) */

  2. @media only screen and (min-width: 59em) {

  3.   .layout-two-col .layout-region {

  4.     float: right;

  5.   }

  6. }