JSFiddle - React, Tailwind, and code Playground

HTML

<div class="cell_name">
<a href="#Ivanov" onClick="showhide('backend')";>Иванов</a></div>
<div class="cell_name">
<a href="#Petrov" onClick="showhide('backend')";>Петров</a></div>
<div class="cell_name">
<a href="#Kozlov" onClick="showhide('backend')";>Козлов</a></div>

<div id="backend" style=" display: none" align="center">
<form name=bookmark method="POST"> 
<input type="text" id=name />
 
 <script>  
document.getElementById('name').value = location.hash.replace(/^#/, '');
</script> 
  
 <input type="submit" value="Отправка">
  </form>

</div>

CSS

#backend {
display:none;
padding-top:20 px;
background: blue;
}

JavaScript

function showhide(){
      $('#backend').toggle('slow');
}