fix respomsive example tailwind (#24582)

Co-authored-by: JJ Kasper <jj@jjsweb.site>

Author: holiq

examples/with-tailwindcss/pages/index.js

@@ -8,7 +8,7 @@ export default function Home() {
         <link rel="icon" href="/favicon.ico" />
       </Head>
 
-      <main className="flex flex-col items-center justify-center flex-1 px-20 text-center">
+      <main className="flex flex-col items-center justify-center w-full flex-1 px-20 text-center">
         <h1 className="text-6xl font-bold">
           Welcome to{' '}
           <a className="text-blue-600" href="https://nextjs.org">