diff --git a/viewer/index.html b/viewer/index.html
index 9c580a3..44681d0 100644
--- a/viewer/index.html
+++ b/viewer/index.html
@@ -21,6 +21,13 @@
body, .leaflet-container {
background: #333;
}
+
+ img.leaflet-tile {
+ image-rendering: -moz-crisp-edges;
+ image-rendering: -o-crisp-edges;
+ image-rendering: -webkit-optimize-contrast;
+ -ms-interpolation-mode: nearest-neighbor;
+ }