diff --git a/inspector/src/FeedInspector.js b/inspector/src/FeedInspector.js
index e446e88..070893a 100644
--- a/inspector/src/FeedInspector.js
+++ b/inspector/src/FeedInspector.js
@@ -95,6 +95,9 @@ export class FeedInspector {
     if (source) {
       $("input#source", $("#request-param")).placeholder = source;
       $("input#source", $("#request-param")).value = "";
+    } else {
+      $("input#source", $("#request-param")).placeholder =
+        "Source not configured. Please specify it here.";
     }
     $("#request-param").classList.remove("hidden");
 
diff --git a/inspector/src/style.css b/inspector/src/style.css
index 64ff12e..fae766e 100644
--- a/inspector/src/style.css
+++ b/inspector/src/style.css
@@ -111,6 +111,9 @@ ul#filter-list {
       margin-top: 0.5rem;
       overflow-x: auto;
 
+      pre {
+        margin: 0;
+      }
       code {
         white-space: pre;
       }