WordPress/wp-includes/blocks/pullquote/editor.css

.wp-block-pullquote.is-style-solid-color blockquote p{
  font-size:32px;
}
.wp-block-pullquote.is-style-solid-color .wp-block-pullquote__citation{
  font-style:normal;
  text-transform:none;
}

.wp-block-pullquote .wp-block-pullquote__citation{
  color:inherit;
}