mastodon/app/javascript/styles/rtl.scss

body.rtl {
  direction: rtl;

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

  .character-counter__wrapper {
    margin-right: 0;
    margin-left: 16px;
  }

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

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

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

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

  .column-header__setting-arrows {
    float: left;
  }

  .compose-form__modifiers {
    border-radius: 0 0 0 4px;
  }

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

  .status__avatar {
    left: auto;
    right: 10px;
  }

  .status {
    padding-left: 10px;
    padding-right: 68px;
  }

  .status__info .status__display-name {
    padding-left: 25px;
    padding-right: 0;
  }

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

  .status__relative-time {
    float: left;
  }

  .status__action-bar-button {
    float: right;
    margin-right: 0;
    margin-left: 18px;
  }

  .status__action-bar-dropdown {
    float: right;
  }

  .privacy-dropdown__dropdown {
    left: auto;
    right: 0;
  }

  .dropdown--active .dropdown__content {
    text-align: right;
  }

  .dropdown--active .dropdown__content::before {
    left: auto;
    right: 8px;
  }

  .dropdown--active .dropdown__content > ul {
    left: auto;
    right: -10px;
  }

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

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

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

  .fa-ul {
    margin-left: 0;
    margin-left: 2.14285714em;
  }

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

  @media screen and (min-width: 1025px) {
    .column,
    .drawer {
      padding-left: 5px;
      padding-right: 5px;

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

      &:last-child {
        padding-right: 0;
        padding-left: 10px;
      }
    }

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