Starting again with what has been developed as sandbox/map.

src/theme/layer.css

@@ -0,0 +1,8 @@
+.background {
+  position: fixed;
+  width: 4032px;
+  height: 2268px;
+  z-index: -1;
+  transform-origin: top left;
+}
+

src/theme/map.css

@@ -1,17 +0,0 @@
-.tiles {
-  position: relative;
-  width: 100%;
-  height: 100%;
-}
-
-.tiles p {
-  z-index: 20;
-  position: relative;
-  width: 100%;
-  height: 100%;
-}
-
-.tiles img {
-  max-width: none;
-  position: absolute;
-}

src/theme/viewport.css

@@ -0,0 +1,11 @@
+.viewport {
+    position: fixed;
+    width: 100%;
+    height: 100%;
+}
+
+.background img {
+    width: 4032px;
+    height: 2268px;
+  }
+