Fix visible grid around tiles

css/80_app.css

@@ -4367,7 +4367,10 @@ img.tile {
     opacity: 1;
     transition: opacity 120ms linear;
 }
-
+.layer-background img.tile {
+    /* Fix visible grid around tiles borders on Chrome */
+    mix-blend-mode: plus-lighter;
+}
 img.tile-removing {
     opacity: 0;
     z-index: 1;

modules/renderer/tile_layer.js

@@ -18,8 +18,7 @@ export function rendererTileLayer(context) {
 
 
     function tileSizeAtZoom(d, z) {
-        var EPSILON = 0.002;    // close seams
-        return ((d.tileSize * Math.pow(2, z - d[2])) / d.tileSize) + EPSILON;
+        return ((d.tileSize * Math.pow(2, z - d[2])) / d.tileSize);
     }