wagtail/client/scss/components/_breadcrumb.scss

.breadcrumb {
  @include unlist();
  @include clearfix();
  padding-top: 1.4em;
  font-size: 0.85em;
  line-height: 1.5em;
  margin-inline-start: 2em;
  background: $color-teal;

  li,
  .breadcrumb-item {
    display: block;
    float: left;
    position: relative;
    text-decoration: none;
    white-space: nowrap;
    padding: 4px;

    &:hover {
      background: $color-teal-dark;
    }

    &.breadcrumb-dropdown {
      padding: 0;
      font-size: initial;
    }

    .t-default .u-btn-current {
      color: inherit;
      background: rgba(0, 91, 94, 0.6);
      font-size: 1.15em;
      border: 0;
      line-height: 1.6;
    }
  }

  li > a,
  .breadcrumb-link {
    color: $color-white;
    display: block;
    padding: calc(0.5em - 4px) 1em;
    white-space: nowrap;
    line-height: 1.6em;

    &:hover {
      background: $color-teal-dark;
      color: $color-white;

      .arrow_right_icon {
        color: $color-teal;
      }
    }

    .title {
      display: inline-block;
      max-width: 11.8em;
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
      vertical-align: bottom;
    }
  }

  .home_icon {
    @include svg-icon(1em);
    transform: scale(1.5) translate(0, 0.1em);
  }

  .arrow_right_icon {
    @include svg-icon(1em);
    color: $color-teal-dark;
    transform: scale(1.75) translate(0.3em, 0.1em);
  }

  @include media-breakpoint-up(sm) {
    padding-top: 0;
    background: $color-teal-darker;
    margin-inline-start: -($desktop-nice-padding);
    margin-inline-end: -($desktop-nice-padding);

    .home_icon {
      margin-inline-start: 1.25em;
    }

    .arrow_right_icon {
      color: $color-teal;
    }
  }
}