diff --git a/web/src/pages/app/dialogs.css b/web/src/pages/app/dialogs.css
index 96c9b93..6a87ada 100644
--- a/web/src/pages/app/dialogs.css
+++ b/web/src/pages/app/dialogs.css
@@ -102,25 +102,31 @@
 
 .preview-shell {
   height: 100%;
+  max-height: 100%;
   padding: 0;
   background: #f4f7f9;
   display: grid;
   grid-template-columns: 180px 1fr;
   min-height: 0;
+  overflow: hidden;
 }
 
 .preview-process-panel {
   min-width: 0;
+  min-height: 0;
+  height: 100%;
   display: grid;
   grid-template-rows: minmax(0, 1fr) auto;
   border-right: 1px solid #d8e0e8;
   background: #ffffff;
+  overflow: hidden;
 }
 
 .preview-process-section {
   min-height: 0;
+  overflow: hidden;
   display: grid;
-  grid-template-rows: auto 1fr auto;
+  grid-template-rows: auto minmax(0, 1fr) auto auto;
 }
 
 .preview-process-header {
@@ -139,7 +145,9 @@
 
 .preview-process-tree {
   min-height: 0;
+  max-height: 100%;
   overflow: auto;
+  overscroll-behavior: contain;
   list-style: none;
   margin: 0;
   padding: 8px;
@@ -178,9 +186,14 @@
 
 .preview-process-tree button {
   width: 100%;
+  min-height: 30px;
+  display: block;
   text-align: left;
   border-color: transparent;
   background: transparent;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .preview-process-tree li.is-active button {
@@ -198,6 +211,9 @@
 }
 
 .preview-process-status {
+  min-height: 44px;
+  max-height: 78px;
+  overflow: auto;
   padding: 6px 8px 8px;
   border-top: 1px solid #eef2f5;
   color: #647586;
@@ -206,6 +222,10 @@
 }
 
 .preview-scene-section {
+  min-height: 0;
+  max-height: 236px;
+  overflow: auto;
+  overscroll-behavior: contain;
   border-top: 1px solid #d8e0e8;
 }
 
@@ -255,13 +275,14 @@
 .preview-canvas-panel {
   min-width: 0;
   min-height: 0;
+  overflow: hidden;
 }
 
 .preview-viewport {
   position: relative;
   width: 100%;
   height: 100%;
-  min-height: 420px;
+  min-height: 0;
   overflow: hidden;
 }