retrospring/app/assets/stylesheets/overrides/_popover.scss

.popover {
  box-shadow: $box-shadow;
  background-color: var(--raised-bg);
}

.rs-popover {
  --popover-arrow-border: transparent;
  --popover-border-color: transparent;
}

.popover-body p:last-child {
  margin-bottom: 0;
}