How to remove this black area? i have already delete the block

Site URL: https://smarlling.com

Hi, 

How to remove this black area? i have already delete the block

You can't. It's what is left over. The page is the full height of the screen, and your content is less than that, so its just there.

You can change the color though.

#siteWrapper {
    background-color: red;
}