diff --git a/client/src/elm/ManyDecks/Pages/Decks/Edit/CallEditor.elm b/client/src/elm/ManyDecks/Pages/Decks/Edit/CallEditor.elm
index e47a3d3..a6d9194 100644
--- a/client/src/elm/ManyDecks/Pages/Decks/Edit/CallEditor.elm
+++ b/client/src/elm/ManyDecks/Pages/Decks/Edit/CallEditor.elm
@@ -434,16 +434,30 @@ viewLine wrap model line =
 clusterAtoms : List ( a, Atom ) -> List ( ( a, Atom ), List ( a, Atom ) )
 clusterAtoms line =
     let
+        ifBroken c =
+            if c == ' ' then
+                False
+
+            else
+                True
+
         isCluster ( _, a ) ( _, b ) =
             case a of
                 Letter c _ ->
                     case b of
                         Letter _ _ ->
-                            if c == ' ' then
-                                False
+                            ifBroken c
 
-                            else
-                                True
+                        Slot _ _ ->
+                            ifBroken c
+
+                        _ ->
+                            False
+
+                Slot _ _ ->
+                    case b of
+                        Letter c _ ->
+                            ifBroken c
 
                         _ ->
                             False
@@ -461,7 +475,18 @@ viewClusters v ( single, rest ) =
             v single
 
         _ ->
-            Html.span [] (single :: rest |> List.map v)
+            let
+                content =
+                    single :: rest
+
+                attrs =
+                    if content |> List.any ((\( _, a ) -> a) >> isSlot) then
+                        [ HtmlA.class "affixed-slot" ]
+
+                    else
+                        []
+            in
+            Html.span attrs (content |> List.map v)
 
 
 viewAtom : (Msg -> msg) -> Model -> ( Int, Atom ) -> Html msg
diff --git a/client/src/scss/cards/_card.scss b/client/src/scss/cards/_card.scss
index 47d1ec2..57f51dc 100644
--- a/client/src/scss/cards/_card.scss
+++ b/client/src/scss/cards/_card.scss
@@ -65,7 +65,6 @@
           display: inline flex;
           flex-grow: 1;
           flex-basis: 3em;
-          max-width: 14em;
 
           &.filled {
             display: contents;
@@ -74,6 +73,7 @@
 
           &.empty {
             flex-grow: 1;
+            min-height: 1.15em;
             border-bottom: 0.075em solid var(--fg);
             margin-bottom: 0.2em; // line-height - font-size
           }
diff --git a/client/src/scss/decks/_edit.scss b/client/src/scss/decks/_edit.scss
index 8b736f2..9e7ff2e 100644
--- a/client/src/scss/decks/_edit.scss
+++ b/client/src/scss/decks/_edit.scss
@@ -133,11 +133,25 @@
     background-color: #4285f4;
   }
 
+  .slot.empty {
+    flex-grow: 10 !important;
+  }
+
+  .affixed-slot {
+    display: inline flex;
+    flex-wrap: wrap;
+    flex-grow: 1;
+
+    .slot.empty {
+      min-width: 3em;
+    }
+  }
+
   .spacer {
     display: block;
     flex-basis: 0;
     flex-grow: 1;
-    height: 1.2em;
+    height: 1.15em;
   }
 
   #call-input-ghost {