diff --git a/services/web/frontend/stylesheets/pages/editor/ide-lumiere.scss b/services/web/frontend/stylesheets/pages/editor/ide-lumiere.scss
index 9c5d51594e..8ee2060f9f 100644
--- a/services/web/frontend/stylesheets/pages/editor/ide-lumiere.scss
+++ b/services/web/frontend/stylesheets/pages/editor/ide-lumiere.scss
@@ -447,5 +447,12 @@ $lum-noise: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' wi
     --font-size-03: 1.125rem;  // 18px (was 16px)
     --toolbar-height: 48px;    // was 40px
     --toolbar-small-height: 40px; // was 32px
+
+    // Prevent iOS/Android auto-zoom when tapping into the editor.
+    // Browsers zoom any focused editable element whose font-size < 16px.
+    // `max(1rem, 1em)` honours the user's size setting if it is already ≥ 16px.
+    .cm-content {
+      font-size: max(1rem, 1em) !important;
+    }
   }
 }