As a SW Engineer I give you two feedbacks about the frontend you published.

1) Introduce the cookie policy message. This may sounds "stupid" but it's crucial to have it when you advertise a website on a large set of user (like the potential one on this forum). It's just a javascript that can be easily imported into your web application but it will definely save you from legal problems in EU.

GDPR and cookies: https://gdpr.eu/cookies/

Example of script: https://github.com/orestbida/cookieconsent

2) Usage of alert messages is discouraged for different reasons:

• Many scam websites uses alert to show you trash messages and your users can have alert blockers to prevent display
• Modern browsers (such as chrome) provide a native block to alerts.

https://i.ibb.co/8jr7CBx/img-site.png

Consider a redesign, maybe with a dismissable block