How to add title for div class container instead of using h3 tag

I work on asp.net razor page i face issue i can't add title for div class container and title must be with top border 

exactly as field set and legend 

so how to apply title to be part from top border using html and css and jquery 

 

     

         

             


                  
Classes
 
                 

                 
             
         
        
     
 

  

and to fill div class container and classlist with data i use jquery below

$('#btnDisplay').click(function (event) {
     event.preventDefault();
     $('#classesContainer').attr('title', 'Classes');
   
     var dropdown = $('#accountclassname-select');
     dropdown.empty();
   
     $.ajax({
         url: '?handler=AccountClassName',
         type: "GET",
         dataType: "json",
         success: function (response) {
             $('#classesContainer').show();
             $('#classesList').html(''); // Clear existing classes
             $('#classesList').append(' All  
');
          
             $.each(response, function (i, classes) {
                 var checkbox = $('');
                 var span = $('' + classes.classAccountName + '');
                 var listItem = $('
').append(checkbox, span);
                 $('#classesList').append(listItem);
             });
          
         }
     });
 });

so how to assign title for div classcontainer ?