style nits on homepage (#112)

* style nits on homepage

* Update index.mdx

Author: alexeagle

index.mdx

@@ -38,8 +38,10 @@ Rebuild only what is necessary. Get fast incremental builds with Bazel's advance
 </Columns>
 </div>
 
+<div className="text-2xl">
 Essential Bazel
----------------
+</div>
+
 Build and test software of any size, quickly and reliably. Industry leaders like Google, Stripe, and Dropbox trust Bazel to build heavy-duty, mission-critical infrastructure, services, and applications.
 
 <Columns cols={3}>
@@ -60,14 +62,17 @@ Use these resources to efficiently look up the commands, queries, and terminolog
 </Columns>
 
 
-<div className="max-w-64">
+<div className="justify-items-center">
+<div className="max-w-96">
 <Card title="Release Notes" img="/images/release_notes.svg" cta="View notes" link="https://github.com/bazelbuild/bazel/releases/latest">
 Bazel is always evolving — check the release notes to see what's changed in the latest releases, and how that affects your builds.
 </Card>
 </div>
+</div>
 
+<div className="text-2xl">
 What's New?
------------
+</div>
 
 Catch up on the latest documentation, community events, and programs.
 <Columns cols={3}>