discourse/app/assets/stylesheets/common/base/header.scss

.d-header {
  width: 100%;
  position: absolute;
  top: 0;
  z-index: z("header");
  background-color: $header_background;
  box-shadow: 0 2px 4px -1px rgba(0, 0, 0, .25);

  .docked & {
    position: fixed;
    backface-visibility: hidden;  /** do magic for scrolling performance **/
  }

  .contents {
    margin: 8px 0;
  }

  .title {
    float: left;
    a, a:visited {
      color: $header_primary;
    }
  }

  #site-logo {
    max-height: 40px;
  }

  .d-icon-home {
    font-size: 1.643em;
  }

  .panel {
    float: right;
    position: relative;
    display: flex;
    align-items: center;
  }

  .header-buttons {
    margin-top: .2em;
  }

  .login-button, button.sign-up-button {
    padding: 6px 10px;
    .fa { margin-right: 3px; }
  }

  button.login-button {
    margin-left: 7px;
  }

  .d-header-icons {
    float: right;
  }
}

.header-dropdown-toggle, .drop-down, .panel-body {
  .flagged-posts, .queued-posts {
    background: $danger;
  }
}

.d-header-icons {
  text-align: center;
  margin: 0 0 0 5px;
  list-style: none;

  > li {
    float: left;
  }
  .icon {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.2857em;
    height: 2.2857em;
    padding: .2143em;
    color: dark-light-choose(scale-color($header_primary, $lightness: 50%), $header_primary);
    text-decoration: none;
    cursor: pointer;
    border-top: 1px solid transparent;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    transition: all linear .15s;
    img.avatar {
      width: 2.2857em;
      height: 2.2857em;
    }
    &:hover {
      color: $primary;
      background-color: $primary-low;
      border-top: 1px solid transparent;
      border-left: 1px solid transparent;
      border-right: 1px solid transparent;
    }
    &:active {
      color: $primary;
      background-color: $primary-low;
    }
  }
  .drop-down-mode & {
    .active .icon {
      position: relative;
      color: #7b7b7b;
      background-color: $secondary;
      cursor: default;
      border-top: 1px solid $primary-low;
      border-left: 1px solid $primary-low;
      border-right: 1px solid $primary-low;

      &:after {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        z-index: z("header") + 1; // Higher than .menu-panel
        width: 100%;
        height: 0;
        content: "";
        border-top: 1px solid $secondary;
      }
      &:hover {
        border-bottom: none;
      }
    }
  }

  .d-icon {
    width: 100%;
    font-size: $font-up-4;
    line-height: $line-height-large;
    display: inline-block;
  }
  .notifications {
    position: relative;
  }
  .ring {
    position: absolute;
    top: -9px;
    z-index: z("base");
    margin-left: 0;
  }
  .header-dropdown-toggle {
    position: relative;
  }
  .badge-notification {
    position: absolute;
    z-index: z("base");
    left: 0;
    top: -4px;
    min-width: 6px;
  }
  .unread-notifications {
    left: auto;
    right: -3px;
    background-color: dark-light-choose($tertiary-medium, $tertiary);
  }
  .unread-private-messages, .ring {
    left: auto;
    right: 25px;
  }
}

.highlight-strong {
  background-color: $highlight-medium;
}

.search-highlight {
  font-weight: bold;
}

#search-help table td {
  padding-right: 10px;
}

// we don't need this X to clear field
#search-term::-ms-clear {
  display: none;
}