updates dark mode palette

Author: ZPain8464

src/theme/Admonition/types.module.css

@@ -9,7 +9,7 @@
 
 .custom_admonition_dark_mode {
   border: #612fea 1px solid;
-  border-left: #e6bffa solid 4px;
+  border-left: #ECE5FF solid 4px;
   border-radius: 10px;
   margin: 0 0 16px 0;
   padding: 16px;