Danxter

Solved

I did not change the wrapper but the header class in order to have a background.

So in the child style.css I put this :

#header{
background-image:url(‘http://localhost.com/wp-content/themes/neodream/image/header.png’);

}

#header-image{
background-image:url(‘http://localhost.com/wp-content/themes/neodream/image/header.png’);
}
.page-template-template-no-sidebars-php #sidebar-header {
background-image:url(‘http://localhost.com/wp-content/themes/neodream/image/header.png’);
}