diff --git a/css/common.css b/css/common.css
index 2f97e9a..8b97de5 100644
--- a/css/common.css
+++ b/css/common.css
@@ -275,6 +275,9 @@ body {
   overflow: auto;
   margin-right: 5px;
 }
+.my-project .my-box .contrast-box .left .list.pitch {
+  background-color: #f6f6f6;
+}
 .my-project .my-box .contrast-box .left .list::-webkit-scrollbar-track-piece {
   background-color: transparent;
 }
diff --git a/css/common.less b/css/common.less
index b0d1a35..fd29bab 100644
--- a/css/common.less
+++ b/css/common.less
@@ -307,6 +307,9 @@ body {
                     height: 575px;
                     overflow: auto;
                     margin-right: 5px;
+                    &.pitch {
+                        background-color: rgba(246, 246, 246, 1);
+                    }
 
                     &::-webkit-scrollbar-track-piece {
                         background-color: transparent;