diff --git a/frontend/index.html b/frontend/index.html
index 7edf80c..1bf308e 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -261,18 +261,14 @@
         .iframe-viewer {
             width: 100%;
             height: 75vh;
-            background: var(--viewer-bg);
-            border-bottom: 2px solid var(--tab-border);
+            display: flex;
+            flex-direction: column;
         }
 
         .iframe-viewer.iframe-viewer-small {
             height: 50vh;
         }
 
-        .iframe-viewer-small iframe {
-            height: calc(50vh - 78px) !important;
-        }
-
         /* Toolbar area (address bar) */
         .iframe-toolbar {
             display: flex;
@@ -385,7 +381,7 @@
 
         .iframe-viewer iframe {
             width: 100%;
-            height: calc(75vh - 78px);
+            flex: 1;
             border: none;
             background: white;
         }