fix(offerwall): mobile responsiveness (#587)

Author: DarianM

frontend/app/routes/offerwall.tsx

@@ -22,6 +22,7 @@ import {
 import HowItWorks from '~/components/offerwall/HowItWorks'
 import { OfferwallBuilder } from '~/components/offerwall/OfferwallBuilder'
 import OfferwallPreview from '~/components/offerwall/OfferwallPreview'
+import { useBodyClass } from '~/hooks/useBodyClass'
 import { useGrantResponseHandler } from '~/hooks/useGrantResponseHandler'
 import { usePathTracker } from '~/hooks/usePathTracker'
 import { useSaveProfile } from '~/hooks/useSaveProfile'
@@ -90,6 +91,7 @@ export default function Offerwall() {
   const { grantResponse, isGrantAccepted, isGrantResponse, OP_WALLET_ADDRESS } =
     useLoaderData<typeof loader>()
   usePathTracker()
+  useBodyClass('has-fixed-action-bar')
 
   useEffect(() => {
     const unsubscribeUpdates = subscribeProfilesToUpdates()