diff --git a/theme-sp-codes.css b/theme-sp-codes.css
index 83e0824..29ae76a 100644
--- a/theme-sp-codes.css
+++ b/theme-sp-codes.css
@@ -375,8 +375,8 @@
     --color-diff-added-row-border: #314a37;
     --color-diff-inactive: #333333;
     --color-body: #444444;
-    --color-box-header: #555555;
-    --color-box-body: #333333;
+    --color-box-header: #4f4f4f;
+    --color-box-body: #2c2c2c;
     --color-text-dark: #eeeeee;
     --color-text: #cccccc;
     --color-text-light: #aaaaaa;