Allow themes to override bg color of even lines of horizon tables
Closes-Bug:
@@ -14,7 +14,7 @@ $main-content-min-width: 900px !default;
$sidebar-width: 220px !default;
$border-color: #dddddd !default;
$table-bg-odd: $table-bg-accent !default;
-$table-bg-even: #ffffff;
+$table-bg-even: #ffffff !default;
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