layout.css in Drupal 9

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;
}
/* Add responsive side gutters to the outer layout container 'main' at smaller sizes */
.main {
  padding: 0 4%;
}
/* Extra large + side margins */
@media screen and (min-width: 80rem) { /* 1200px (large) + 80px (side margins) = 1280px */
  .main {
    padding: 0;
  }
}