app/javascript/stylesheets/notifications.scss

Summary

Maintainability
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$background: lighten($success, 5%) !default;

// stylelint-disable selector-no-qualifying-type
.main-navbar .navbar-nav > li.notifications {
  position: relative;

  &.read > a {
    color: fade-out(darken(#fff, 40%), .55);
  }

  .unread-count {
    position: absolute;
    top: -4px;
    right: -12px;
    display: none;
    width: 16px;
    height: 16px;
    font-size: 10px;
    line-height: 16px;
    color: #fff;
    text-align: center;
    background-color: $danger;
    border-radius: 100%;
  }
}

.notifications-icon.fa {
  width: 20px;
  height: 20px;
  font-size: 20px;
  line-height: 20px;
}

.popover--notifications {
  min-width: 300px;
}

.notification-message-list {
  padding-left: 0;
  margin: -9px -14px;
  list-style: none;
}

.notification-message {
  a {
    display: block;
    padding: 5px;
    line-height: 16px;
    color: $body-color;
    text-decoration: none;

    &:focus,
    &:hover {
      background-color: darken(#fff, 5%);
    }
  }

  + .notification-message {
    border-top: 1px solid #ccc;
  }
}

.popover-footer {
  padding: 8px 14px;
  line-height: 18px;
  text-align: center;
  border-top: 1px solid $popover-border-color;
  border-radius: 0 0 ($border-radius-lg) ($border-radius-lg);
}

.notification-unread {
  background-color: $background;
}

@include media-breakpoint-down(md) {
  .navbar-notifications {
    position: absolute;
    top: 15px;
    left: 50%;
  }
}
// stylelint-enable selector-no-qualifying-type