Overleaf/services/web/frontend/stylesheets/components/popover.scss

.popover {
  @include shadow-md;
  @include dark-bg;

  line-height: var(--line-height-02);
}

.popover-header {
  padding-bottom: 0;
  margin-bottom: var(--spacing-02);
  font-weight: 600;

  & + .popover-body {
    padding-top: 0;
  }
}