diff --git a/src/pages/overall/overall-course/overall-course.scss b/src/pages/overall/overall-course/overall-course.scss
index 52c10c8..1a96922 100644
--- a/src/pages/overall/overall-course/overall-course.scss
+++ b/src/pages/overall/overall-course/overall-course.scss
@@ -11,7 +11,10 @@
     // Limit name length
     white-space: nowrap;
 
-    // Content
+    // Expansion color
+    background: #f9f9f9;
+
+    // Main card content
     .course-card-content.main
     {
         padding: 0 20px 0 20px;