fix(copy-button): update styling to match Webpack theme and improve hover state

Author: theEquinoxDev

src/components/CodeBlockWithCopy/CodeBlockWithCopy.scss

@@ -37,15 +37,15 @@
   /* Always visible */
   opacity: 1;
 
-  background-color: #7c3aed;
+  background-color: #175d96;
   color: #e2e8f0;
 
   transition:
     background-color 0.2s,
     transform 0.1s;
 
   &:hover {
-    background-color: #6d28d9;
+    background-color: #2f85d0;
   }
 
   /* Success */