update

static/admin/assets/scss/vendors/bootstrap/_grid.scss

@@ -0,0 +1,22 @@
+// Row
+//
+// Rows contain your columns.
+
+@if $enable-grid-classes {
+  .row {
+    @include make-row();
+
+    > * {
+      @include make-col-ready();
+    }
+  }
+}
+
+
+// Columns
+//
+// Common styles for small and large grid columns
+
+@if $enable-grid-classes {
+  @include make-grid-columns();
+}