diff --git a/homepage/static/assets/js/captcha_refresh.js b/homepage/static/assets/js/captcha_refresh.js
index dc2a7b9..47dcbc2 100644
--- a/homepage/static/assets/js/captcha_refresh.js
+++ b/homepage/static/assets/js/captcha_refresh.js
@@ -5,11 +5,15 @@ const captcha_hidden_field = document.forms[0].children[4].children[0];
 let g_captcha_timeout_remain = g_captcha_timeout_seconds;
 let g_current_captcha_id = captcha_hidden_field.value;
 
+function getColorScheme() {
+    return window.matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark";
+}
+
 async function getNewCaptcha() {
     const id = await fetch("/captcha/").then(r => r.text());
     g_current_captcha_id = id;
     captcha_hidden_field.value = id;
-    setTimeout(() => { captcha_img.src = `/captcha/${id}/image` }, 600);
+    setTimeout(() => { captcha_img.src = `/captcha/${id}/image?style=${getColorScheme()}` }, 600);
     g_captcha_timeout_remain = g_captcha_timeout_seconds;
 }