diff --git a/ui/src/styles.css b/ui/src/styles.css
index 4cf12073b92eb616137e0ac9ce293e2be9fc8d8e..102f0785dc084fc995e58eb5d923b89a17294a55 100644
--- a/ui/src/styles.css
+++ b/ui/src/styles.css
@@ -3184,6 +3184,35 @@ svg {
   .diff-viewer-comment-input {
     min-height: 60px;
   }
+
+  /* Patch Tool Monaco editor mobile styles - hide gutters completely */
+  .patch-tool-monaco-editor .monaco-editor .margin {
+    display: none !important;
+    width: 0 !important;
+  }
+
+  .patch-tool-monaco-editor .monaco-editor .margin-view-overlays {
+    display: none !important;
+    width: 0 !important;
+  }
+
+  .patch-tool-monaco-editor .monaco-editor .editor-scrollable {
+    left: 0 !important;
+  }
+
+  .patch-tool-monaco-editor .monaco-editor .lines-content {
+    margin-left: 0 !important;
+  }
+
+  /* Ensure patch tool diff editor uses full width */
+  .patch-tool-monaco-editor .monaco-diff-editor {
+    width: 100% !important;
+  }
+
+  .patch-tool-monaco-editor .monaco-diff-editor .editor.modified {
+    width: 100% !important;
+    left: 0 !important;
+  }
 }
 
 /* Injected text indicator (for diff comments) */