.wp-block-quote:not(.is-style-plain) {
  border-left: 2px solid var(--wp--preset--color--accent-4);
}

.wp-block-quote.is-style-plain {
  padding: 0;
}

@supports (max-width: min(1px, 100%)) {
  @media (min-width: 768px) {
    .wp-block-quote:not(.is-style-plain) {
      position: relative;
      left: calc(var(--wp--custom--quote-indent) / 2);
      max-width: min(
        calc(var(--wp--style--global--content-size) - var(--wp--custom--quote-indent)),
        calc(100% - var(--wp--custom--quote-indent))
      );
    }
  }
}