Add baseline start point (#1)

Co-authored-by: Michael DiLeo <michael.dileo@oakstreethealth.com>
Reviewed-on: #1

public/scss/layout/_overflow-auto.scss

@@ -0,0 +1,12 @@
+@use "sass:map";
+@use "../settings" as *;
+
+@if map.get($modules, "layout/overflow-auto") and $enable-classes {
+  /**
+   * Overflow auto
+   */
+
+  #{$parent-selector} .overflow-auto {
+    overflow: auto;
+  }
+}