Background problem…

Hello,

I have a problem with background in “big-preview” class (I think).

In my custom.css I have this :

html, .socket_color, .footer_color, .alternate_color, .container_wrap_logo, .main_color{

background-image: url(../../../../../img/background.svg), url(../../../../../img/background_dark.png);

background-size: 100% 100%, auto;

background-position: left top, left top;

background-repeat: no-repeat, repeat;

background-attachment: fixed, fixed;

}

but in single post without sidebar with big preview as you can see here:

http://www.juls.ch/studios/lost/

there is a border without my background but with color defined in styles options.

How can I remove this border??

Thx

Jul