chore: add css class

Author: arunjaindev

src/css/base.scss

@@ -3443,6 +3443,10 @@ button.anchor {
     height: 380px !important;
 }
 
+.h-400 {
+    height: 400px;
+}
+
 .h-500 {
     height: 500px !important;
 }