diff --git a/doccano/app/server/static/bulma.js b/doccano/app/server/static/bulma.js
deleted file mode 100644
index 23ffa0a4..00000000
--- a/doccano/app/server/static/bulma.js
+++ /dev/null
@@ -1,10 +0,0 @@
-// The following code is based off a toggle menu by @Bradcomp
-// source: https://gist.github.com/Bradcomp/a9ef2ef322a8e8017443b626208999c1
-(function() {
-    var burger = document.querySelector('.burger');
-    var menu = document.querySelector('#'+burger.dataset.target);
-    burger.addEventListener('click', function() {
-        burger.classList.toggle('is-active');
-        menu.classList.toggle('is-active');
-    });
-})();
\ No newline at end of file