Object not displaying\being hidden

Hi all,

I am building a test site and it is very nearly complete, however when i have put everything in a container and given everything a background an object has disappeared.

The item class item is called 'yellow-block' and as far as I can tell it is being hidden by the container or content class.

I have attached my whole project folder;Web-Challenge-Site.zip

Would someone be able to offer advice please?

Thank you,
Joshua DavisIT TechnicianAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Chris StanyonWebDevCommented:
In HTML everything has a stacking order, defined by a property called z-index. The default is 0. Your yellow_block has been given a z-index of -1 (main.css: 150) so you're telling it to stack behind everything else. Some of the elements that it's now stacked behind have a background colour (they're not transparent) which is why you can't see it.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Joshua DavisIT TechnicianAuthor Commented:
Thanks Chris, that helped, I brought everything forward by 1, except the backgrounds, and it all shows in the correct order.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.