layout.css in Drupal 8

This file is used to create generic layout styles.

More specific layout items may be found within their respective files, e.g. the layout for two columns is in the layout-2-cols.css file.

File

core/profiles/demo_umami/themes/umami/css/layout/layout.css

/**
 * @file
 * This file is used to create generic layout styles.
 *
 * More specific layout items may be found within their respective files, e.g.
 * the layout for two columns is in the layout-2-cols.css file.
 */

.container {
  max-width: 1200px;
  margin: auto;
}