Fix background color of table footer row

textbook/style.css

@@ -668,7 +668,8 @@ table td {
 }
 
 .entry-content table tbody tr:nth-child(odd),
-.widget-area table tbody tr:nth-child(odd) {
+.widget-area table tbody tr:nth-child(odd),
+.widget-area table {
   background: #FFF;
 }