discourse/app/assets/stylesheets/common/base/sidebar-more-section-links.scss

.sidebar-more-section-links-details {
  margin-left: 1.5em;

  .sidebar-more-section-links-details-summary {
    padding: 0.35em 0.5em;
    color: var(--primary-high);
    font-size: var(--font-down-1);
    transition: background-color 0.25s;
    display: flex;
    align-items: center;
    list-style: none;

    .d-icon {
      margin-left: auto;
      color: var(--primary-medium);
    }

    &:focus,
    &:hover {
      background: var(--d-sidebar-highlight-color);
    }

    &::before {
      display: none;
    }
  }

  .sidebar-more-section-links-details-content {
    position: absolute;
    background-color: var(--secondary);
    width: 100%;
    box-shadow: shadow("dropdown");
    z-index: z("base") + 1;

    .sidebar-section-link-wrapper {
      margin-left: none;
    }
  }
}