diff --git a/src/Tron/Control/Impl/Button.elm b/src/Tron/Control/Impl/Button.elm
index 8c5c7ef..fc17ad7 100644
--- a/src/Tron/Control/Impl/Button.elm
+++ b/src/Tron/Control/Impl/Button.elm
@@ -50,19 +50,72 @@ iconAt : List String -> Icon
 iconAt path =
     Icon
         (always
-        <| Url.fromString
-        <| Url.relative path [])
+        <| Just
+        <| toLocalUrl
+        <| path
+        )
 
 
 themedIconAt : (Theme -> List String) -> Icon
 themedIconAt f =
     themedIcon
         <| \theme ->
-            Url.fromString
-            <| Url.relative (f theme) []
+            Just
+            <| toLocalUrl
+            <| f theme
 
 
 
 setFace : Face -> Control a -> Control a
 setFace face (Core.Control _ val handler) =
-    Core.Control face val handler
\ No newline at end of file
+    Core.Control face val handler
+
+
+-- https://github.com/elm/url/issues/10
+-- We would like to use `Url` for icons, but it doesn't support local files,
+-- so here we have some dirty hacks;
+
+
+localMarker : String
+localMarker = "@@@@____local___@@@@"
+
+
+toLocalUrl : List String -> Url
+toLocalUrl path =
+    toLocalUrl_ <| Url.relative path []
+
+
+toLocalUrl_ : String -> Url
+toLocalUrl_ path =
+    { protocol = Url.Https
+    , host = localMarker
+    , port_ = Nothing
+    , path = path
+    , query = Nothing
+    , fragment = Nothing
+    }
+
+
+encodeMaybeLocalUrl : Url -> String
+encodeMaybeLocalUrl url =
+    if url.host == localMarker then
+        localMarker ++ url.path
+    else
+        Url.toString url
+
+
+decodeMaybeLocalUrl : String -> Maybe Url
+decodeMaybeLocalUrl str =
+    if String.startsWith localMarker str then
+        String.dropLeft (String.length localMarker) str
+            |> toLocalUrl_
+            |> Just
+    else Url.fromString str
+
+
+maybeLocalUrlToString : Url -> String
+maybeLocalUrlToString url =
+    if url.host == localMarker then
+        "./" ++ url.path
+    else
+        Url.toString url
\ No newline at end of file
diff --git a/src/Tron/Control/Json/Button.elm b/src/Tron/Control/Json/Button.elm
index 451bb3a..fc8c0e3 100644
--- a/src/Tron/Control/Json/Button.elm
+++ b/src/Tron/Control/Json/Button.elm
@@ -38,11 +38,11 @@ encodeFace face =
             E.object
                 [ ( "kind", E.string "icon" )
                 , ( "dark", case fn Theme.Dark of
-                        Just url -> E.string <| Url.toString url
+                        Just url -> E.string <| Button.encodeMaybeLocalUrl url
                         Nothing -> E.null
                   )
                 , ( "light", case fn Theme.Light of
-                        Just url -> E.string <| Url.toString url
+                        Just url -> E.string <| Button.encodeMaybeLocalUrl url
                         Nothing -> E.null
                   )
                 ]
@@ -68,8 +68,8 @@ decodeFace =
                     D.map2
                         (\darkSrc lightSrc theme ->
                             case theme of
-                                Theme.Dark -> darkSrc |> Maybe.andThen Url.fromString
-                                Theme.Light -> lightSrc |> Maybe.andThen Url.fromString
+                                Theme.Dark -> darkSrc |> Maybe.andThen Button.decodeMaybeLocalUrl
+                                Theme.Light -> lightSrc |> Maybe.andThen Button.decodeMaybeLocalUrl
                         )
                         (D.field "dark" <| D.maybe D.string)
                         (D.field "light" <| D.maybe D.string)
diff --git a/src/Tron/Render/Control/Button.elm b/src/Tron/Render/Control/Button.elm
index dbf4165..8fdbfd4 100644
--- a/src/Tron/Render/Control/Button.elm
+++ b/src/Tron/Render/Control/Button.elm
@@ -82,7 +82,7 @@ viewFace theme ctx face label =
         Button.WithIcon (Button.Icon icon) ->
             let
                 iconUrl =
-                    icon theme |> Maybe.map Url.toString |> Maybe.withDefault ""
+                    icon theme |> Maybe.map Button.maybeLocalUrlToString |> Maybe.withDefault ""
                     --"./assets/" ++ icon ++ "_" ++ Theme.toString theme ++ ".svg"
                 ( iconWidth, iconHeight ) = iconSize ctx.cellShape bounds
                 ( iconX, iconY ) =