Vote-1027: Update width for NVRF button at mobile

[clmedders]

Jira ticket

Vote-1027

Description

Setting max-width at the mobile large break point to help the drop-down and button maintain the same width in in mobile view.

Deployment and testing

Pre-deploy

n/a

Post-deploy

n/a

QA/Test

1. Pull down the branch and cd into the votegov dir and run npm run build
2. Visit /register/alabama and scroll to the download nvrf button and adjust your screen size.. as the screen gets larger it should keep the same width until the mobile large breakpoint at 480

Checklist for the Developer

• A link to the JIRA ticket has been included above.
• No merge conflicts exist with the target branch.
• Automated tests have passed on this PR.
• A reviewer has been designated.
• Deployment and testing steps have been documented above, if applicable.

Checklist for the Peer Reviewers

• The file changes are relevant to the task objective.
• Code is readable and includes appropriate commenting.
• Code standards and best practices are followed.
• QA/Test steps were successfully completed, if applicable.
• Applicable logs are free of errors.