diff --git a/src/vs/workbench/parts/extensions/browser/media/extensionEditor.css b/src/vs/workbench/parts/extensions/browser/media/extensionEditor.css
index 71ea1393dc4de71f1c38459b28672d643461e065..b5aeae7795d7ffcb88abc4accaa64eea3a82a551 100644
--- a/src/vs/workbench/parts/extensions/browser/media/extensionEditor.css
+++ b/src/vs/workbench/parts/extensions/browser/media/extensionEditor.css
@@ -235,7 +235,8 @@
 	vertical-align: middle;
 }
 
-.vs-dark .extension-editor > .body > .content table .colorBox {
+.vs-dark .extension-editor > .body > .content table .colorBox,
+.hc-black .extension-editor > .body > .content table .colorBox {
 	border-color: rgb(238, 238, 238);
 }