From 0067369af12b5a540624a8adc1961f27c338bc31 Mon Sep 17 00:00:00 2001
From: Jeff Emmett <jeffemmett@gmail.com>
Date: Sat, 21 Mar 2026 16:50:10 -0700
Subject: [PATCH] fix(canvas): prevent mobile scroll by using flex layout for
 canvas page
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On mobile, header/tab-row switch from fixed to sticky (in-flow), but
#app.canvas-layout still had height:100vh — total content exceeded
viewport causing unwanted scroll. Fix: body becomes a flex column
(100dvh, overflow hidden), header/tab-row flex-shrink:0, #app fills
remaining space with flex:1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 website/public/shell.css | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/website/public/shell.css b/website/public/shell.css
index c20dc4f..6d98eb3 100644
--- a/website/public/shell.css
+++ b/website/public/shell.css
@@ -406,8 +406,26 @@ body.rstack-sidebar-open #toolbar {
   #app {
     padding-top: 0;
   }
+  /* Canvas on mobile: header/tab-row are sticky (in-flow), so body must
+     become a flex column to prevent the 100vh #app from overflowing. */
+  body:has(#app.canvas-layout) {
+    height: 100dvh;
+    overflow: hidden;
+    overscroll-behavior: none;
+    display: flex;
+    flex-direction: column;
+  }
+  body:has(#app.canvas-layout) .rstack-header {
+    flex-shrink: 0;
+  }
+  body:has(#app.canvas-layout) .rstack-tab-row {
+    flex-shrink: 0;
+  }
   #app.canvas-layout {
     padding-top: 0;
+    height: auto;
+    flex: 1;
+    min-height: 0;
   }
   .rspace-iframe-wrap {
     position: relative;