AdminLte/build/scss/_header.scss

/*
 * Component: Main Header
 * ----------------------
 */

.main-header {
  padding: 0 16px 0 0;
  .navbar-brand {
    font-weight: 200;
    width: $sidebar-width;
    padding: $main-header-brand-padding-y $main-header-brand-padding-x;
    background: darken($brand-primary, 5%);
    transition: width $transition-speed $transition-fn;
    overflow: hidden;
    margin-right: 0;

    > .logo-mini {
      display: none;
    }

    @include media-breakpoint-up(md) {
      .sidebar-mini.sidebar-collapse & {
        width: $sidebar-mini-width;
        > .logo {
          display: none;
        }
        > .logo-mini {
          display: inline;
        }
      }
    }

    @include media-breakpoint-down(md) {
      width: $sidebar-mini-width;
      > .logo {
        display: none;
      }
      > .logo-mini {
        display: inline;
      }
    }
  }

  /*.navbar-nav .nav-item {
    margin: 0;
  }*/

  &.navbar-toggleable .navbar-nav .nav-link {
    padding: $main-header-link-padding-y $main-header-link-padding-x;
    position: relative;
  }

  /*.open > .nav-link,
  .nav-link:hover {
    background: rgba(0, 0, 0, .1);
  }*/

  .has-img {
    padding-top: $main-header-link-padding-y - 2;
    padding-bottom: $main-header-link-padding-y - 2;
  }

  .navbar-nav[class*="-right"] {
    .dropdown-menu {
      margin-top: -3px;
      right: 0;
      left: auto;
      @media (max-width: breakpoint-max(xs)) {
        left: 0;
        right: auto;
      }
    }
  }

}

// Add shadow to the navbar if wanted
.navbar-shadow {
  @include box-shadow(0 3px 3px rgba(0, 0, 0, 0.1));
}

// Add this class to images within a nav-link
.navbar-img {
  height: $main-header-height / 2;
  width: auto;
}

// Navbar tags (used as badges in nav-link)
.navbar-tag {
  position: absolute;
  top: 9px;
  right: 5px;
  font-size: $font-size-xs - .1;
  padding: 2px 4px;
}