JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset id='companyinfo'><legend>Company info</legend>
    
    <div class='input string optional'>
        <label for='company_count_1' class='string optional'>Count</label>
        <input type='text' size='50' name='company_count_1' id='company_count' maxlength="255"  class='string optional' />
        <div class='button-row'>
            <button class='add'>Add info</button>
            <button disabled='disabled' class='remove'>Remove</button>
        </div>
    </div>
    
    <div class="input string optional">
        <label for="company_navn_1" class="string optional">Navn</label>
        <input type="text" size="50" name="company_navn_1" maxlength="255" id="company_navn" class="string optional">
        <div class='button-row'>
            <button class='add'>Add info</button>
            <button disabled='disabled' class='remove'>Remove</button>
        </div>
    </div>    
</fieldset>

CSS

fieldset#companyinfo  {
    border: 3px double silver;
    padding: 12px;
}
#companyinfo label {
    display: block;
}
#companyinfo .button-row {
    display: block;
    text-align:right;
    margin-top: 8px;
    width: 332px;
}
#companyinfo input {
    display: block;
    width: 320px;
    margin: 8px 0;
    padding: 4px;
    
}
#companyinfo .input {
    margin-bottom: 10px;
    border: 1px dotted white;
    padding: 10px;
    background-color:#B1D853;
    
    
}

JavaScript

$('button.add').live('click', function(e) {
    var element = $(this).parents('.input').find('input').last().clone().prop('value','yryry');
    var counter = $(this).parents('.input').find('input').length + 1;
    var newname = element.prop('id') + '_' + counter;
    element.prop('name', newname);
    element.insertAfter($(this).parents('.input').find('input').last());
    $('button.remove').removeProp('disabled');
})
$('button.remove', '#companyinfo').live('click', function(e) {
    $(this).parents('.input').find('input').last().remove('input');
    if ($(this).parents('.input').find('input').length == 1) {
        $(this).parents('.input').find('button.remove').prop('disabled', 'disabled');
    }
});