jQuery Grid Plugin - jqGrid

How to remove border from treegrid ?

Using style below removes column and row separator lines but border around tree remains. How to remove this border ? I tried 

<table id="west-grid" style="border:0 none !important">
</table> 

but border over whole tree remains.

I was able to remove lines inside tree using style:

.table

tr

.table

td
.ui-jqgrid tr.jqgrow td {

border

}

:0 none !important;

.ui-jqgrid

tr.jqgrow td {

border

}

:0 none !important;

.ui-jqgrid

.selected-row, .ui-jqgrid .selected-row td {

border

}

:0 none !important;

.ui-state-highlight

, .ui-widget-content .ui-state-highlight {

border

}

:0 none !important;