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;
  .btn {
    margin-left: 0.5em;
  }
  input,
  .select-kit {
    cursor: auto;
    width: 100%;
    margin-bottom: 0;
  }
}

.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);
  }
}

// topic share modal

.share-topic-modal {
  .modal-header {
    .subtitle {
      color: var(--primary-med-or-secondary-med);
    }
  }

  form {
    margin-bottom: 0;
  }

  .invite-users {
    display: flex;
    flex-direction: column;
    margin: 1.5em 0 0.25em;
    width: 100%;

    button {
      margin-top: 0;
      margin-right: 0;
    }
  }
}

// topic invite modal

.create-invite-modal {
  form {
    margin: 0;
  }

  input {
    margin-bottom: 0;
  }

  label {
    margin-right: 0.5em;
    .d-icon {
      color: var(--primary-medium);
      margin-right: 0.75em;
    }
  }

  textarea {
    margin-bottom: 0;
  }

  .input-group:not(:last-of-type) {
    margin-bottom: 1em;
  }
  .input-group.input-expires-at,
  .input-group.input-email,
  .input-group.invite-max-redemptions {
    input[type="text"] {
      width: unset;
    }
  }

  .existing-topic,
  p {
    // p is for "no topics found"
    margin-left: 1.75em;
    margin-top: 0.25em;
  }

  .input-group.input-email {
    display: flex;
    align-items: baseline;
    label {
      display: inline;
    }
  }

  .invite-email-container {
    flex: 1 1 auto;
    #invite-email {
      width: 100%;
    }
  }

  .invite-max-redemptions {
    label {
      display: inline;
    }
    input {
      width: 80px;
    }
  }

  .invite-custom-message {
    label {
      margin-left: 1.75em;
    }
  }

  .input-group {
    textarea#invite-message,
    &.invite-to-topic input[type="text"],
    .group-chooser,
    .topic-chooser,
    .user-chooser,
    .future-date-input-selector,
    .future-date-input-date-picker,
    .future-date-input-time-picker {
      margin-left: 1.75em;
      width: calc(100% - 1.75em);
    }

    .future-date-input-date-picker,
    .future-date-input-time-picker {
      display: inline-block;
      margin: 0em 0em 0em 1.75em;
      width: calc(50% - 2em);

      input {
        height: 34px;
      }
    }
  }
}