fix: fixing the background color in darkmode

Author: websiddu

lib/Code/Code.css

@@ -16,6 +16,7 @@ html.dark .code-block span {
   @apply bg-yellow-100/70;
 }
 
-html.dark .code-block span.line.highlighted {
+html.dark .code-block span.line.highlighted,
+html.dark .code-block span.line.highlighted span {
   @apply dark:!bg-gray-700;
 }