diff --git a/app/javascript/mastodon/features/compose/index.tsx b/app/javascript/mastodon/features/compose/index.tsx
index 892cbb97617..527e541e84d 100644
--- a/app/javascript/mastodon/features/compose/index.tsx
+++ b/app/javascript/mastodon/features/compose/index.tsx
@@ -166,7 +166,7 @@ const Compose: React.FC<{ multiColumn: boolean }> = ({ multiColumn }) => {
           <div className='drawer__inner'>
             <ComposeFormContainer />
 
-            <div className='drawer__inner__mastodon'>
+            <div className='drawer__inner__mastodon with-zig-zag-decoration'>
               <img alt='' draggable='false' src={mascot ?? elephantUIPlane} />
             </div>
           </div>
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 8f12152de93..e6a8f26e8a5 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -3734,12 +3734,12 @@ a.account__display-name {
 }
 
 .drawer__inner__mastodon {
-  background: var(--clr-bg-primary)
-    url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 234.80078 31.757813" width="234.80078" height="31.757812"><path d="M19.599609 0c-1.05 0-2.10039.375-2.90039 1.125L0 16.925781v14.832031h234.80078V17.025391l-16.5-15.900391c-1.6-1.5-4.20078-1.5-5.80078 0l-13.80078 13.099609c-1.6 1.5-4.19883 1.5-5.79883 0L179.09961 1.125c-1.6-1.5-4.19883-1.5-5.79883 0L159.5 14.224609c-1.6 1.5-4.20078 1.5-5.80078 0L139.90039 1.125c-1.6-1.5-4.20078-1.5-5.80078 0l-13.79883 13.099609c-1.6 1.5-4.20078 1.5-5.80078 0L100.69922 1.125c-1.600001-1.5-4.198829-1.5-5.798829 0l-13.59961 13.099609c-1.6 1.5-4.200781 1.5-5.800781 0L61.699219 1.125c-1.6-1.5-4.198828-1.5-5.798828 0L42.099609 14.224609c-1.6 1.5-4.198828 1.5-5.798828 0L22.5 1.125C21.7.375 20.649609 0 19.599609 0z" fill="#{hex-color(darken($ui-base-color, 4%))}"/></svg>')
-    no-repeat bottom / 100% auto;
+  position: relative;
+  background: var(--clr-bg-primary);
   flex: 1;
   min-height: 47px;
   display: none;
+  contain: content;
 
   > img {
     display: block;
diff --git a/app/javascript/styles/mastodon/modal.scss b/app/javascript/styles/mastodon/modal.scss
index 761e7f9ea5c..1ac1894b110 100644
--- a/app/javascript/styles/mastodon/modal.scss
+++ b/app/javascript/styles/mastodon/modal.scss
@@ -7,20 +7,6 @@
   flex-direction: column;
   height: 100vh;
   padding: 0;
-
-  &::after {
-    content: '';
-    position: absolute;
-    inset: auto 0 0;
-    height: 32px;
-    background-color: var(--clr-bg-accent-subtle);
-
-    /* Decorative zig-zag pattern at the bottom of the page */
-    mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 234.80078 31.757813" width="234.80078" height="31.757812"><path d="M19.599609 0c-1.05 0-2.10039.375-2.90039 1.125L0 16.925781v14.832031h234.80078V17.025391l-16.5-15.900391c-1.6-1.5-4.20078-1.5-5.80078 0l-13.80078 13.099609c-1.6 1.5-4.19883 1.5-5.79883 0L179.09961 1.125c-1.6-1.5-4.19883-1.5-5.79883 0L159.5 14.224609c-1.6 1.5-4.20078 1.5-5.80078 0L139.90039 1.125c-1.6-1.5-4.20078-1.5-5.80078 0l-13.79883 13.099609c-1.6 1.5-4.20078 1.5-5.80078 0L100.69922 1.125c-1.600001-1.5-4.198829-1.5-5.798829 0l-13.59961 13.099609c-1.6 1.5-4.200781 1.5-5.800781 0L61.699219 1.125c-1.6-1.5-4.198828-1.5-5.798828 0L42.099609 14.224609c-1.6 1.5-4.198828 1.5-5.798828 0L22.5 1.125C21.7.375 20.649609 0 19.599609 0z" fill="black"/></svg>');
-    mask-position: bottom;
-    mask-repeat: repeat-x;
-    z-index: -1;
-  }
 }
 
 .modal-layout__mastodon {
@@ -50,3 +36,19 @@
     margin-top: 0;
   }
 }
+
+.with-zig-zag-decoration {
+  &::after {
+    content: '';
+    position: absolute;
+    inset: auto 0 0;
+    height: 32px;
+    background-color: var(--clr-bg-accent-subtle);
+
+    /* Decorative zig-zag pattern at the bottom of the page */
+    mask-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 234.80078 31.757813" width="234.80078" height="31.757812"><path d="M19.599609 0c-1.05 0-2.10039.375-2.90039 1.125L0 16.925781v14.832031h234.80078V17.025391l-16.5-15.900391c-1.6-1.5-4.20078-1.5-5.80078 0l-13.80078 13.099609c-1.6 1.5-4.19883 1.5-5.79883 0L179.09961 1.125c-1.6-1.5-4.19883-1.5-5.79883 0L159.5 14.224609c-1.6 1.5-4.20078 1.5-5.80078 0L139.90039 1.125c-1.6-1.5-4.20078-1.5-5.80078 0l-13.79883 13.099609c-1.6 1.5-4.20078 1.5-5.80078 0L100.69922 1.125c-1.600001-1.5-4.198829-1.5-5.798829 0l-13.59961 13.099609c-1.6 1.5-4.200781 1.5-5.800781 0L61.699219 1.125c-1.6-1.5-4.198828-1.5-5.798828 0L42.099609 14.224609c-1.6 1.5-4.198828 1.5-5.798828 0L22.5 1.125C21.7.375 20.649609 0 19.599609 0z" fill="black"/></svg>');
+    mask-position: bottom;
+    mask-repeat: repeat-x;
+    z-index: -1;
+  }
+}
diff --git a/app/views/layouts/modal.html.haml b/app/views/layouts/modal.html.haml
index d25dd22d375..26a03472fe2 100644
--- a/app/views/layouts/modal.html.haml
+++ b/app/views/layouts/modal.html.haml
@@ -1,7 +1,7 @@
 - content_for :header_tags do
   = vite_typescript_tag 'public.tsx', crossorigin: 'anonymous'
 
-- content_for :body_classes, 'modal-layout compose-standalone'
+- content_for :body_classes, 'modal-layout with-zig-zag-decoration compose-standalone'
 
 - content_for :content do
   - if user_signed_in? && !@hide_header