diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/AbpInputTagHelperService.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/AbpInputTagHelperService.cs
index 5bebab0257..9436acbbbf 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/AbpInputTagHelperService.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/AbpInputTagHelperService.cs
@@ -97,7 +97,7 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
 
         protected virtual string SurroundInnerHtmlAndGet(TagHelperContext context, TagHelperOutput output, string innerHtml, bool isCheckbox)
         {
-            return "<div class=\"" + (isCheckbox ? "custom-checkbox custom-control" : "form-group") + "\">" +
+            return "<div class=\"" + (isCheckbox ? "custom-checkbox custom-control mb-2" : "form-group") + "\">" +
                    Environment.NewLine + innerHtml + Environment.NewLine +
                    "</div>";
         }