diff --git a/packages/block-library/src/pullquote/theme.scss b/packages/block-library/src/pullquote/theme.scss
index 53fbdd9e04b5cb..6d0b1ef076a2db 100644
--- a/packages/block-library/src/pullquote/theme.scss
+++ b/packages/block-library/src/pullquote/theme.scss
@@ -4,6 +4,12 @@
 	margin-bottom: 1.75em;
 	color: #555;
 
+	.is-dark-theme & {
+		border-top: 4px solid $light-gray-placeholder;
+		border-bottom: 4px solid $light-gray-placeholder;
+		color: $light-gray-placeholder;
+	}
+
 	cite,
 	footer,
 	&__citation {
@@ -11,5 +17,9 @@
 		text-transform: uppercase;
 		font-size: 0.8125em;
 		font-style: normal;
+
+		.is-dark-theme & {
+			color: $light-gray-placeholder;
+		}
 	}
 }
diff --git a/packages/block-library/src/quote/theme.scss b/packages/block-library/src/quote/theme.scss
index b801f8c687f0d6..b9cfe524716099 100644
--- a/packages/block-library/src/quote/theme.scss
+++ b/packages/block-library/src/quote/theme.scss
@@ -3,6 +3,10 @@
 	margin: 0 0 1.75em 0;
 	padding-left: 1em;
 
+	.is-dark-theme & {
+		border-left: 0.25em solid $light-gray-placeholder;
+	}
+
 	cite,
 	footer,
 	&__citation {
@@ -11,6 +15,10 @@
 		margin-top: 1em;
 		position: relative;
 		font-style: normal;
+
+		.is-dark-theme & {
+			color: $light-gray-placeholder;
+		}
 	}
 
 	&.has-text-align-right {