diff --git a/sandbox/templates/base.html b/sandbox/templates/base.html
index c79eb42..02ade71 100644
--- a/sandbox/templates/base.html
+++ b/sandbox/templates/base.html
@@ -63,14 +63,18 @@ let isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme:
 if (isDarkMode) {
     document.documentElement.setAttribute('data-bs-theme', 'dark');
 }
+else {
+    document.documentElement.setAttribute('data-bs-theme', 'light');
+}
 
 window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', (event) => {
     isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
 
     if (isDarkMode) {
         document.documentElement.setAttribute('data-bs-theme', 'dark');
-    } else {
-        document.documentElement.removeAttribute('data-bs-theme');
+    }
+    else {
+        document.documentElement.setAttribute('data-bs-theme', 'light');
     }
 });