diff --git a/lib/src/utils.dart b/lib/src/utils.dart
new file mode 100644
index 0000000..e5fc200
--- /dev/null
+++ b/lib/src/utils.dart
@@ -0,0 +1,80 @@
+class Col {
+  
+  static const String xs1 = "col-1";
+  static const String xs2 = "col-2";
+  static const String xs3 = "col-3";
+  static const String xs4 = "col-4";
+  static const String xs5 = "col-5";
+  static const String xs6 = "col-6";
+  static const String xs7 = "col-7";
+  static const String xs8 = "col-8";
+  static const String xs9 = "col-9";
+  static const String xs10 = "col-10";
+  static const String xs11 = "col-11";
+  static const String xs12 = "col-12";
+
+  static const String sm1 = "col-sm-1";
+  static const String sm2 = "col-sm-2";
+  static const String sm3 = "col-sm-3";
+  static const String sm4 = "col-sm-4";
+  static const String sm5 = "col-sm-5";
+  static const String sm6 = "col-sm-6";
+  static const String sm7 = "col-sm-7";
+  static const String sm8 = "col-sm-8";
+  static const String sm9 = "col-sm-9";
+  static const String sm10 = "col-sm-10";
+  static const String sm11 = "col-sm-11";
+  static const String sm12 = "col-sm-12";
+
+  static const String md1 = "col-md-1";
+  static const String md2 = "col-md-2";
+  static const String md3 = "col-md-3";
+  static const String md4 = "col-md-4";
+  static const String md5 = "col-md-5";
+  static const String md6 = "col-md-6";
+  static const String md7 = "col-md-7";
+  static const String md8 = "col-md-8";
+  static const String md9 = "col-md-9";
+  static const String md10 = "col-md-10";
+  static const String md11 = "col-md-11";
+  static const String md12 = "col-md-12";
+
+  static const String lg1 = "col-lg-1";
+  static const String lg2 = "col-lg-2";
+  static const String lg3 = "col-lg-3";
+  static const String lg4 = "col-lg-4";
+  static const String lg5 = "col-lg-5";
+  static const String lg6 = "col-lg-6";
+  static const String lg7 = "col-lg-7";
+  static const String lg8 = "col-lg-8";
+  static const String lg9 = "col-lg-9";
+  static const String lg10 = "col-lg-10";
+  static const String lg11 = "col-lg-11";
+  static const String lg12 = "col-lg-12";
+
+  static const String xl1 = "col-xl-1";
+  static const String xl2 = "col-xl-2";
+  static const String xl3 = "col-xl-3";
+  static const String xl4 = "col-xl-4";
+  static const String xl5 = "col-xl-5";
+  static const String xl6 = "col-xl-6";
+  static const String xl7 = "col-xl-7";
+  static const String xl8 = "col-xl-8";
+  static const String xl9 = "col-xl-9";
+  static const String xl10 = "col-xl-10";
+  static const String xl11 = "col-xl-11";
+  static const String xl12 = "col-xl-12";
+
+  static const String xxl1 = "col-xxl-1";
+  static const String xxl2 = "col-xxl-2";
+  static const String xxl3 = "col-xxl-3";
+  static const String xxl4 = "col-xxl-4";
+  static const String xxl5 = "col-xxl-5";
+  static const String xxl6 = "col-xxl-6";
+  static const String xxl7 = "col-xxl-7";
+  static const String xxl8 = "col-xxl-8";
+  static const String xxl9 = "col-xxl-9";
+  static const String xxl10 = "col-xxl-10";
+  static const String xxl11 = "col-xxl-11";
+  static const String xxl12 = "col-xxl-12";
+}