JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<head>
<title>Filtered CSV File</title>
</head>
  <body>
    <h1>
      Filtered CSV FIle
    </h1>
   <br/>
   <br/>
   <div class="myButtons">
     <input type="button" value="Add new row" class="btn btn-info" id="addRow">
     <input  type="button" value="Delete rows" id="delete-row" class="btn btn-info">
   </div>
   <br/>
   <div class="table-responsive">
     <table class="dataframe my_class" id="my_id">
       <thead>
         <tr style="text-align:right;">
           <th> </th>
           <th>col1</th>
           <th>col2</th>
           <th>col3</th>
           <th>col4</th>
           <th>col5</th>
           <th>col6</th>
           <th>col7</th>
           <th>col8</th>
         </tr>
       </thead>
         
       <tbody>
         <tr>
           <th>1</th>
           <td>row1</td>
           <td>row1</td>
           <td>row1</td>
           <td></td>
           <td>row1</td>
           <td>
           B1
           <select name="code">
                   <option value="default">Default</option>
                    <option value="a">AAA</option>
                    <option value="b">BBB</option>
                    <option value="b1">B1</option>
                    <option value="c">C</option>
                </select></td>
           <td>row1</td>
           <td>row1</td>
         </tr>
         <tr>
           <th>2</th>
           <td>row2</td>
           <td>row2</td>
           <td>row2</td>
           <td></td>
           <td>row2</td>
           <td>   AAA
           <select name="code">
                    <option value="default">Default</option>
                    <option value="a">AAA</option>
                    <option value="b">BBB</option>
                    <option value="b1">B1</option>
                    <option value="c">C</option>
                </select></td>
           <td>row2</td>
           <td>row2</td>
         </tr>
         <tr>
           <th>3</th>
           <td>row3</td>
           <td>row3</td>
          ...

CSS

table {
            border-collapse: collapse;
            border: 1px black solid;
            font: 12px sans-serif;
            width: 100%;
            table-layout:auto;
            
        }
        td {
            border: 1px black solid;
            text-align: left;
            padding: 2px;
        }

        thead:hover{
            text-decoration: none !important;
        }

        thead tr:first-child{
            color:white;
            text-align: center;
            background-color: #5bc0de;
            padding: 10px;
        }
        tr:nth-child(even){
            background-color: #f2f2f2
        }
        
        tr:hover{
            background-color: #5bc0de;
        }
        button{
            display: inline;
            padding: 50px;
        }
        input button{
            display: inline;
        }
        .dropbtn{
            background-color: blue;
        }
        .table-responsive {
            overflow-y: auto;
            height: 800px;
        }
        .table-responsive table {
            border-collapse: collapse;
            width: 100%;
        }
        .table-responsive thead th{
            position: sticky;
            top: 0;
            background-color: #5bc0de;
            padding: 2px;
        }
        ::-webkit-scrollbar {
            width: 12px;
        }
        ::-webkit-scrollbar-thumb {
            background-color: darkgrey;
            outline: 1px solid slategrey;
        }
        .myButtons{
            display: inline;
            padding: 20px;
        }

JavaScript

$(function(){
	var firstDDM = ['aaa','bbb','ccc','ddd'];
  var firstshortcut = ['a','b','c','d'];
  var option = "",
  		select = "";
  for(var i=0; i<firstDDM.length;i++){
  	option += '<option value="'+ firstshortcut[i] + '">' + firstDDM[i] + '</option>';
  }
  select = '<select class="firstDDM" type="firstDDM">' + option + '</select>';
  
  $("tr").each(function() {
            $(this).find("td:eq(3)").append(select);
        });
});




$("#addRow").click(function(){
        $("#my_id").each(function(){
            var tds='<tr>';
            jQuery.each($('tr:last th', this), function(){
                tds += '<th>' +'<input type="checkbox" name="record" tittle="Delete this row"></input>' + '</th>';
            });
            jQuery.each($('tr:last td', this), function(){
                
                if($('select',this).length){
                    tds+= '<td>' + $(this).html() + '</td>';
                }else{
                    tds+= '<td></td>';
                }
            });
            tds+= '</tr>';
            $('tbody',this).append(tds);
            $('#my_id tbody tr:last').attr("contentEditable", true);
        });
        
    });

 //for the columns that need to be imported with dropdowns create editable option - temporarlly 
    $(function() {
    $("tr").each(function() {
        $(this).find("td:eq(3), td:eq(4),td:eq(5)").attr("contentEditable", true);
        });
    });
    
    //Find and remove selected table rows
    $('#delete-row').click(function(){
        var r = confirm('Are you sure you want to delete them all?');
        $("tbody").find('input[name="record"]').each(function(){
            if($(this).is(":checked")){
                if(r == true){
                    $(this).parents("tr").remove();
                }else{
                    return false;
                }
                
            }
        });
    });