diff --git a/src/platforms/GitHub/hooks/useGitHubCodeFold.tsx b/src/platforms/GitHub/hooks/useGitHubCodeFold.tsx
index 303886d..83c49db 100644
--- a/src/platforms/GitHub/hooks/useGitHubCodeFold.tsx
+++ b/src/platforms/GitHub/hooks/useGitHubCodeFold.tsx
@@ -11,7 +11,7 @@ const tableSelector = `.blob-wrapper table`
 const selectorOfLineNumber = `.blob-num`
 const selectorOfLineContent = `.blob-code`
 
-const theCSSClassForToggleElementOnActive = 'active'
+const theCSSClassForToggleElementOnActive = 'gitako-code-fold-active'
 function init() {
   type LineNumber = number // alias
   const blocks: LineNumber[] = [] // startLine -> exclusiveEndLine
diff --git a/src/styles/index.scss b/src/styles/index.scss
index 7677d94..d4f28eb 100644
--- a/src/styles/index.scss
+++ b/src/styles/index.scss
@@ -144,7 +144,7 @@ $minimal-z-index: max($github-header-z-index, $github-pull-request-float-header-
         );
       }
 
-      &.active {
+      &.gitako-code-fold-active {
         .gitako-code-fold-handler {
           &::before {
             transform: rotate(-90deg);
@@ -655,7 +655,7 @@ $minimal-z-index: max($github-header-z-index, $github-pull-request-float-header-
           @include interactive-background(
             var(--gitako-bg-primary),
             var(--gitako-bg-tertiary),
-            var(--gitako-bg-secondary),
+            var(--gitako-bg-secondary)
           );
 
           &.disabled {