window { 
 display: block; 
} 

tree { 
 display: table; 
 background-color: #eeeeee; 
 border: none; 
 border-spacing: 0px; 
// border-collapse: collapse; 
} 

treeitem { 
 display: table-row; 
} 

treehead { 
 display: table-header-group; 
} 

treebody { 
 display: table-row-group; 

} 

treecol {
 display: table-column;
 width: 200px;
}

treecell { 
 display: table-cell;
 font-family: Verdana, Sans-Serif;
 font-size: 8pt;
} 

treehead treeitem treecell { 
 background-color: #a0a0a0; 
 border: thin black solid; 
} 

treecell[selectedcell] {
 background-color: yellow;
 }
 
treecell[sortActive="true"] {
 background-color: #404040;
 }
 
treecol[sortActive="true"] {
  background-color: green;
}