diff --git a/sites/svelte-5-preview/src/lib/CodeMirror.svelte b/sites/svelte-5-preview/src/lib/CodeMirror.svelte
index 3b7794c400..f6cb4c21ff 100644
--- a/sites/svelte-5-preview/src/lib/CodeMirror.svelte
+++ b/sites/svelte-5-preview/src/lib/CodeMirror.svelte
@@ -286,7 +286,6 @@
 
 		.cm-tooltip {
 			border: none;
-			background-color: transparent;
 			font-family: var(--sk-font);
 			max-width: calc(100vw - 10em);
 			position: relative;
@@ -329,6 +328,10 @@
 			bottom: -4px;
 		}
 
+		.cm-tooltip:has(.cm-diagnostic) {
+			background: transparent;
+		}
+
 		.cm-tooltip:has(.cm-diagnostic-warning) {
 			--bg: var(--warning);
 			--fg: #222;