Index: src/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css
===================================================================
--- src/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css	(revision 58768)
+++ src/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css	(working copy)
@@ -649,6 +649,10 @@
 	border: 0 solid;
 }
 
+figure.wp-block-pullquote blockquote {
+	color: inherit;
+}
+
 .wp-block-pullquote.alignleft blockquote > .editor-rich-text p,
 .wp-block-pullquote.alignright blockquote > .editor-rich-text p {
 	font-size: 20px;