refactor: standardize background color to #121212

- Replaced inconsistent gray-900 and #171717 background colors with unified #121212 across all pages
- Removed unused imports from multiple component files
- Cleaned up trailing spaces in className attributes

src/pages/cloud/CloudFeatures.tsx

@@ -406,7 +406,7 @@ export function CloudFeatures() {
     <section
       id="overview"
       aria-label="Features for investing all your money"
-      className="bg-gray-900 py-20 sm:py-32"
+      className="bg-[#121212]  py-20 sm:py-32"
     >
       <Container>
         <div className="mx-auto max-w-2xl lg:mx-0 lg:max-w-3xl">