header.css in Drupal 10

This file is used to style the header.

It styles the header as a global component; it does not style individual header items, such as a menu, which are styled by their own CSS files.

File

core/profiles/demo_umami/themes/umami/css/components/regions/header/header.css

/**
 * @file
 * This file is used to style the header.
 *
 * It styles the header as a global component; it does not style individual
 * header items, such as a menu, which are styled by their own CSS files.
 */

.layout-header {
  padding: 0;
  background: #fff;
}

.region-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 4%;
}

@media screen and (min-width: 48em) {
  .region-header {
    padding-top: 0;
  }
}
/* Medium */
@media screen and (min-width: 48rem) { /* 768px */
  .region-header {
    padding-top: 0;
  }
}
/* Extra large + side margins */
@media screen and (min-width: 80rem) { /* 1200px (large) + 80px (side margins) = 1280px */
  .region-header {
    padding: 0;
  }
}