mastodon/app/javascript/styles/mastodon/rich_text.scss

.status__content__text,
.e-content,
.reply-indicator__content {
  pre,
  blockquote {
    margin-bottom: 20px;
    white-space: pre-wrap;
    unicode-bidi: plaintext;

    &:last-child {
      margin-bottom: 0;
    }
  }

  blockquote {
    padding-left: 10px;
    border-left: 3px solid $darker-text-color;
    color: $darker-text-color;
    white-space: normal;

    p:last-child {
      margin-bottom: 0;
    }
  }

  & > ul,
  & > ol {
    margin-bottom: 20px;
  }

  b,
  strong {
    font-weight: 700;
  }

  em,
  i {
    font-style: italic;
  }

  ul,
  ol {
    margin-left: 2em;

    p {
      margin: 0;
    }
  }

  ul {
    list-style-type: disc;
  }

  ol {
    list-style-type: decimal;
  }
}

.reply-indicator__content {
  blockquote {
    border-left-color: $inverted-text-color;
    color: $inverted-text-color;
  }
}