Why do my CSS buttons keep dissapearing?

[Awalji]

Hi guys

For some reason some of my css buttons are dissapearing.

Like on my login page. The sign up and log in button have gone. They were until now and im not sure how they were removed all of a sudden.

Does anyone know the reason for this and how I can get them back or in fact for any css buttons that dissapear how do I get them to come back?

My website is: www.healthvital.co.uk

Thank you

[lat9]

Hmm, I see both the "Sign Up" and "Sign In" buttons when I click the login link (using FireFox as my browser).

[lruskauff]

I see them on my iPad. But on your home page, the green bar at the top covers up your shopping cart, home and login.