diff --git a/in/style/main.css b/in/style/main.css
index f23fafb..b67599a 100644
--- a/in/style/main.css
+++ b/in/style/main.css
@@ -57,6 +57,8 @@
 #link, #theme, #swap {
     background-color: var(--button-background);
 }
+#swap::after { content: "←"; }
+body.swap #swap::after { content: "→"; }
 #vcard {
     background-color: var(--qrcode-background);
 }