Custom CSS

Hello,

I developed a web app that uses "Custom CSS." Up until a few days ago it worked great (Fig 1), but know its not displaying properly (Fig 2). After checking the "Editor" tab I see the "error" displayed on Fig 3, nothing was changed from either the "Custom CSS"or HTML code. As soon as I remove everything inside <STYLE> the error is gone but I'm still stuck with the grey background.

Any help would be appreciated.

HTML Code:

{BEGIN styleCSSFiles}
      <LINK href="{$stylepath}" rel="stylesheet" type="text/css">
      <STYLE>
         body{
           background-image:url("http://cdn.pcwallart.com/images/solid-color-wallpaper-2.jpg");
           background-size: cover;
         }
      </STYLE>
{END styleCSSFiles}

Custom CSS Code:

   .function-login .rnr-c > * {
   background: rgba(17,17,17,0) !important;
     	//background: darkblue !important;
      //opacity:.6;
      //background: transparent;
    }   

.function-admin_rights_list .rnr-c > *, 
.function-admin_rights_list .rnr-s-undermenu > *,
.function-admin_rights_list .rnr-b-vmenu > *,
.function-admin_rights_list .rnr-s-2 > *,
.function-admin_rights_list .rnr-row > *,
.function-admin_rights_list .rnr-toprow > *
{
background-color : transparent !important;
background : transparent !important;
}

.function-menu .rnr-c > * {
   background: rgba(17,17,17,0) !important;
      //background: darkblue !important;
      //opacity:.6;
      //background: transparent;
    }

.function-add .rnr-c > * {
   background: rgba(17,17,17,0) !important;
      //background: darkblue !important;
      //opacity:.6;
      //background: transparent;
    }

.function-edit .rnr-c > * {
   background: rgba(17,17,17,0) !important;
      //background: darkblue !important;
      //opacity:.6;
      //background: transparent;
    }

.function-search .rnr-c > * {
   background: rgba(17,17,17,0) !important;
  border-style: none;
      //background: darkblue !important;
      //opacity:.6;
      //background: transparent;
    }

.function-view .rnr-c > * {
   background: rgba(17,17,17,0) !important;
      //background: darkblue !important;
      //opacity:.6;
      //background: transparent;
    }

.function-list .rnr-c > *, 
.function-list .rnr-s-undermenu > *,
.function-list .rnr-b-vmenu > *,
.function-list .rnr-s-2 > *,
.function-list .rnr-row > *,
.function-list .rnr-toprow > *
{
background-color : transparent !important;
background : transparent !important;
}