WordPress/wp-includes/blocks/quote/theme-rtl.css

:where(.wp-block-quote){
  border-right:.25em solid;
  margin:0 0 1.75em;
  padding-right:1em;
}
:where(.wp-block-quote) cite,:where(.wp-block-quote) footer{
  color:currentColor;
  font-size:.8125em;
  font-style:normal;
  position:relative;
}
:where(.wp-block-quote).has-text-align-right{
  border-left:.25em solid;
  border-right:none;
  padding-left:1em;
  padding-right:0;
}
:where(.wp-block-quote).has-text-align-center{
  border:none;
  padding-right:0;
}
:where(.wp-block-quote).is-large,:where(.wp-block-quote).is-style-large,:where(.wp-block-quote).is-style-plain{
  border:none;
}