html/css, stretchable edges.

[Mint_Sauce]

I've been building a website and am having problems trying to figure out how to make the edges stretch when the browser is resized.

Can anyone point me in the right direction? Thanks.

 

[Mint_Sauce]

Thanks everyone, I will give it a go.

There's nothing in the edges, just a background image (1px tiled horizontally as it's just some lines).