discourse/app/assets/stylesheets/common/base/share_link.scss

// styles that apply to the "share" modal & popup when sharing a link to a post or topic

.link-share-container,
.notify-user-input {
  display: flex;
  gap: 0.5em;

  input,
  .select-kit {
    cursor: auto;
    width: 100%;
    margin-bottom: 0;
  }
}

.link-share-container {
  .invite-link {
    flex: 1 0;
  }

  .mobile-view & {
    flex-direction: column;
  }
}

.link-share-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;

  button {
    margin-top: 0.5em;
    margin-right: 0.5em;
  }

  .sources {
    display: flex;
  }

  .new-topic {
    margin-right: 0;
  }
}

.share-twitter {
  .d-icon {
    color: var(--twitter);
  }
}
.share-facebook {
  .d-icon {
    color: var(--facebook);
  }
}