diff --git a/packages/viewer/src/lib/renderers/json.ts b/packages/viewer/src/lib/renderers/json.ts
index 25b22bf..7d298c6 100644
--- a/packages/viewer/src/lib/renderers/json.ts
+++ b/packages/viewer/src/lib/renderers/json.ts
@@ -27,6 +27,7 @@ export class JSONRenderer {
 
   update(props: { value: any }) {
     let pre = document.createElement("pre");
+    pre.className = "text-sm";
     pre.style.whiteSpace = "pre-wrap";
     pre.style.wordBreak = "break-all";
     pre.innerText = safeJSONStringify(props.value, 2);