Split sass reset dir in to reset file and base dir.

assets/sass/base/tables/_tables.scss

@@ -0,0 +1,19 @@
+// Tables
+//
+// The `<table>` element displays tabular data in rows, columns, and cells.
+
+table {
+  // Add vertical rhythm margins.
+  @include margin-block(1);
+  // Remove most spacing between table cells.
+  border-collapse: collapse;
+  border-spacing: 0;
+  // Prevent cramped-looking tables
+  width: 100%;
+}
+
+td,
+th {
+  // Remove most spacing between table cells.
+  padding: 0;
+}