Background img only show half

That’s because for the theme, the content area is covering the background itself (with a white color).

Its difficult to say what the best solution for this is, as there’s no content in that area, but you will have to solve this with CSS in the “Custom Stylesheet” option found in your active Image Set.

An example:

#wrap_all, #main {
  background: none !important;
}

it become this, still didn’t work ??

https://www.dorm1828.com/background-manager/