lint fix

Author: nakul-py

style/base.css

@@ -89,7 +89,7 @@
   border: 1px solid var(--jp-border-color2);
   border-radius: 8px;
   padding: 8px 12px;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
+  box-shadow: 0 2px 8px #00000040;
   z-index: 200;
   opacity: 0.95;
   transition: opacity 0.2s ease-in-out;