mastodon/app/javascript/styles/mastodon/rtl.scss

body.rtl {
  direction: rtl;

  .column-header > button {
    text-align: right;
    padding-left: 0;
    padding-right: 15px;
  }

  .radio-button__input {
    margin-right: 0;
    margin-left: 10px;
  }

  .display-name,
  .announcements__item {
    text-align: right;
  }

  .announcements__item__range {
    padding-right: 0;
    padding-left: 18px;
  }

  .reactions-bar {
    margin-left: auto;
    margin-right: -2px;
    direction: rtl;
  }

  .reactions-bar__item__count {
    margin-left: 0;
    margin-right: 6px;
  }

  .announcements__pagination {
    right: auto;
    left: 0;
  }

  .notification__message {
    margin-left: 0;
    margin-right: 68px;
  }

  .announcements__mastodon,
  .drawer__inner__mastodon > img {
    transform: scaleX(-1);
  }

  .notification__favourite-icon-wrapper {
    left: auto;
    right: -26px;
  }

  .column-link__icon,
  .column-header__icon {
    margin-right: 0;
    margin-left: 5px;
  }

  .compose-form .compose-form__buttons-wrapper .character-counter__wrapper {
    margin-right: 0;
    margin-left: 4px;
  }

  .navigation-bar__profile {
    margin-left: 0;
    margin-right: 8px;
  }

  .search__input {
    padding-right: 10px;
    padding-left: 30px;
  }

  .search__icon .fa {
    right: auto;
    left: 10px;
  }

  .columns-area {
    direction: rtl;
  }

  .column-header__buttons {
    left: 0;
    right: auto;
    margin-left: 0;
    margin-right: -15px;
  }

  .column-inline-form .icon-button {
    margin-left: 0;
    margin-right: 5px;
  }

  .column-header__links .text-btn {
    margin-left: 10px;
    margin-right: 0;
  }

  .account__avatar-wrapper {
    float: right;
  }

  .column-header__back-button {
    padding-left: 5px;
    padding-right: 0;
  }

  .column-header__setting-arrows {
    float: left;

    .column-header__setting-btn {
      &:first-child {
        padding-left: 7px;
        padding-right: 5px;
      }

      &:last-child {
        padding-right: 7px;
        padding-left: 5px;
        margin-right: 5px;
        margin-left: 0;
      }
    }
  }

  .setting-toggle__label {
    margin-left: 0;
    margin-right: 8px;
  }

  .account__header__tabs__buttons > .icon-button {
    margin-right: 0;
    margin-left: 8px;
  }

  .account__avatar-overlay-overlay {
    right: auto;
    left: 0;
  }

  .column-back-button--slim-button {
    right: auto;
    left: 0;
  }

  .status__action-bar {
    &__counter {
      margin-right: 0;
      margin-left: 11px;

      .status__action-bar-button {
        margin-right: 0;
        margin-left: 4px;
      }
    }
  }

  .privacy-dropdown__dropdown {
    margin-left: 0;
    margin-right: 40px;
  }

  .privacy-dropdown__option__icon {
    margin-left: 10px;
    margin-right: 0;
  }

  .picture-in-picture__header__account .display-name,
  .detailed-status__display-name .display-name {
    text-align: right;
  }

  .detailed-status__display-avatar {
    margin-right: 0;
    margin-left: 10px;
  }

  .picture-in-picture__header__account .account__avatar {
    margin-right: 0;
    margin-left: 10px;
  }

  .icon-button__counter {
    margin-left: 0;
    margin-right: 4px;
  }

  .notifications-permission-banner__close {
    right: auto;
    left: 10px;
  }

  .detailed-status__favorites,
  .detailed-status__reblogs {
    margin-left: 0;
    margin-right: 6px;
  }

  .fa-ul {
    margin-left: 2.14285714em;
  }

  .fa-li {
    left: auto;
    right: -2.14285714em;
  }

  .admin-wrapper {
    direction: rtl;
  }

  .admin-wrapper .sidebar ul a i.fa,
  a.table-action-link i.fa {
    margin-right: 0;
    margin-left: 5px;
  }

  .simple_form .check_boxes .checkbox label {
    padding-left: 0;
    padding-right: 25px;
  }

  .simple_form .input.with_label.boolean label.checkbox {
    padding-left: 25px;
    padding-right: 0;
  }

  .simple_form .check_boxes .checkbox input[type='checkbox'],
  .simple_form .input.boolean input[type='checkbox'] {
    left: auto;
    right: 0;
  }

  .simple_form .input.radio_buttons .radio {
    left: auto;
    right: 0;
  }

  .simple_form .input.radio_buttons .radio > label {
    padding-right: 28px;
    padding-left: 0;
  }

  .simple_form .input-with-append .input input {
    padding-left: 142px;
    padding-right: 0;
  }

  .simple_form .input.boolean label.checkbox {
    left: auto;
    right: 0;
  }

  .simple_form .input.boolean .label_input,
  .simple_form .input.boolean .hint {
    padding-left: 0;
    padding-right: 28px;
  }

  .simple_form .label_input__append {
    right: auto;
    left: 3px;

    &::after {
      right: auto;
      left: 0;
      background-image: linear-gradient(
        to left,
        rgba(darken($ui-base-color, 10%), 0),
        darken($ui-base-color, 10%)
      );
    }
  }

  .simple_form select {
    background: darken($ui-base-color, 10%)
      url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14.933 18.467' height='19.698' width='15.929'><path d='M3.467 14.967l-3.393-3.5H14.86l-3.392 3.5c-1.866 1.925-3.666 3.5-4 3.5-.335 0-2.135-1.575-4-3.5zm.266-11.234L7.467 0 11.2 3.733l3.733 3.734H0l3.733-3.734z' fill='#{hex-color(lighten($ui-base-color, 12%))}'/></svg>")
      no-repeat left 8px center / auto 16px;
  }

  .table th,
  .table td {
    text-align: right;
  }

  .filters .filter-subset {
    margin-right: 0;
    margin-left: 45px;
  }

  @media screen and (min-width: 631px) {
    .column,
    .drawer {
      padding-left: 5px;
      padding-right: 5px;

      &:first-child {
        padding-left: 5px;
        padding-right: 10px;
      }
    }

    .columns-area > div {
      .column,
      .drawer {
        padding-left: 5px;
        padding-right: 5px;
      }
    }
  }

  .columns-area--mobile .column,
  .columns-area--mobile .drawer {
    padding-left: 0;
    padding-right: 0;
  }

  .card__bar .display-name {
    margin-left: 0;
    margin-right: 15px;
    text-align: right;
  }

  .fa-chevron-left::before {
    content: '\F054';
  }

  .fa-chevron-right::before {
    content: '\F053';
  }

  .column-back-button__icon {
    margin-right: 0;
    margin-left: 5px;
  }

  .simple_form .input.radio_buttons .radio > label input {
    left: auto;
    right: 0;
  }

  .picture-in-picture {
    right: auto;
    left: 20px;
  }
}