diff --git a/.browserslistrc b/.browserslistrc
new file mode 100644
index 0000000..32d4ee7
--- /dev/null
+++ b/.browserslistrc
@@ -0,0 +1,4 @@
+# Tailwind 4's floor: browsers without cascade layers, or Chrome before 111, can't render the
+# app's CSS, so the JS isn't transpiled for them either.
+defaults and fully supports css-cascade-layers
+not chrome < 111
diff --git a/deploy.php b/deploy.php
index 1398058..e77e072 100644
--- a/deploy.php
+++ b/deploy.php
@@ -38,6 +38,7 @@ $rsyncOptions = [
         '.env.test.local',
         '.gitignore',
         '.nvmrc',
+        '.browserslistrc',
         '.php-cs-fixer.cache',
         '.php-cs-fixer.dist.php',
         '.phpunit.result.cache',