diff --git a/artifacts/tx-os/src/components/ui/dialog.tsx b/artifacts/tx-os/src/components/ui/dialog.tsx
index fa003580..84295812 100644
--- a/artifacts/tx-os/src/components/ui/dialog.tsx
+++ b/artifacts/tx-os/src/components/ui/dialog.tsx
@@ -41,23 +41,32 @@ const DialogContent = React.forwardRef<
   const keyboardOpen = keyboardInset > 80
   const dynamicStyle: React.CSSProperties = keyboardOpen
     ? {
-        // Anchor the dialog to the TOP of the visible visual viewport
-        // (right under the iOS status bar) and let it take the full
-        // available height above the keyboard. Anchoring (vs centering)
-        // is critical for tall forms — when the dialog is centered and
-        // the form has many fields, the footer slides into the middle
-        // of the visible area and the bottom half of the form ends up
-        // hidden behind the keyboard. With top-anchor + maxHeight, the
-        // dialog's own flex column (header / scrollable middle /
-        // footer) keeps Save/Cancel pinned above the keyboard and the
-        // rest of the form scrolls inside.
+        // Mobile-sheet behaviour when an on-screen keyboard is open.
         //
-        // The override of `transform` is necessary because the class
-        // string below applies `translate-y-[-50%]`; we need to keep
-        // the horizontal centering but cancel the vertical one.
+        // The base className puts the dialog at left:50%+translateX(-50%)
+        // (horizontal centering) and top:50%+translateY(-50%) (vertical
+        // centering). On iOS Safari with the soft keyboard open the
+        // layout viewport and the visual viewport diverge in BOTH axes
+        // (visualViewport.offsetLeft, .pageLeft and zoom factor can all
+        // shift), which made our previous "top-anchor + translateX(-50%)"
+        // override render as a narrow column shoved against one edge of
+        // the screen.
+        //
+        // To sidestep all of that we drop the centering entirely while
+        // the keyboard is open and pin the dialog as a top-anchored
+        // full-width sheet: explicit left/right insets, no transform,
+        // width:auto so the consumer's `w-[calc(100vw-1rem)]` or
+        // `max-w-3xl` no longer drive horizontal position. The
+        // dialog's internal `flex flex-col` (header / scrollable middle
+        // / sticky footer) then keeps Save/Cancel pinned above the
+        // keyboard and the rest of the form scrolls inside.
         top: `${offsetTop}px`,
+        left: "8px",
+        right: "8px",
+        width: "auto",
+        maxWidth: "none",
         maxHeight: `${height - 8}px`,
-        transform: "translateX(-50%)",
+        transform: "none",
         ...style,
       }
     : (style ?? {})