Adding highlighting to the currently selected VLAN in the top table

so that it is more clear it is selected

html/index.html

@@ -93,6 +93,7 @@ table.t th.num{text-align:right}
 table.t td{padding:6px 8px;border-bottom:1px solid var(--bd);vertical-align:middle}
 table.t tr:last-child td{border-bottom:0}
 table.t tr:hover td{background:var(--sel)}
+table.t tr.sel{background:var(--panel2); font-weight: bold;}
 .num{font-variant-numeric:tabular-nums;text-align:right}
 .scrollx{overflow-x:auto}
 input.in,select.in,textarea.in{