diff --git a/web/map/styles/main.css b/web/map/styles/main.css
index c30e4fb..4f106e1 100644
--- a/web/map/styles/main.css
+++ b/web/map/styles/main.css
@@ -1,3 +1,14 @@
+:root {
+    /* Telegram injects these variables inside its WebApp. Keep a light theme
+       for a normal browser, where that injection is absent. */
+    color-scheme: light;
+    --tg-theme-bg-color: #ffffff;
+    --tg-theme-text-color: #000000;
+    --tg-theme-hint-color: #707579;
+    --tg-theme-secondary-bg-color: #f1f1f1;
+    --tg-theme-destructive-text-color: #e53935;
+}
+
 * {
     /* border: solid 1px #f00; */
     font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
@@ -247,4 +258,4 @@ footer > .i > input {
     100% {
         fill: var(--tg-theme-destructive-text-color) !important;
     }
-}
\ No newline at end of file
+}