message: Slightly better styling for leaderboard ad on game pages.
diff: <!-- Media Bar -->
  <app-media-bar v-if="game.media_count" :media-items="mediaItems" />
  + <section class="section section-thin fill-backdrop">
  <app-ad-widget
  class="-leaderboard-ad"
  v-if="shouldShowAds && !Screen.isMobile"
  placement="top"
  />
  - <section class="section section-thin fill-backdrop">
  <app-page-container xl>
  <div slot="left">
  <app-discover-games-view-overview-statbar />
  @require '~styles-lib/mixins'
  .-leaderboard-ad
  - padding-top: 16px
  padding-bottom: 8px
  + margin-bottom: $line-height-computed
  + border-bottom: $border-width-small solid var(--theme-bg-subtle)
  .-recommended-ad
  width: 300px
  