JSFiddle - React, Tailwind, and code Playground

HTML

<div class="thing">Foo</div>
<div class="thing">Foo</div>
<div class="thing">Foo</div>
<div class="thing">Foo</div>
<div class="thing">Foo</div>

CSS

.thing {
    background-color: rgb(245, 245, 245);
    border: 1px solid rgb(200, 200, 200);
    padding: 10px;
    margin: 5px;
    
    position: relative;
}

.close {
    position: absolute;
    top: 2px;
    right: 2px;
    
    height: 20px;
    width: 20px;
    line-height: 20px;
    
    text-align: center;
    cursor: pointer;
    
    border: 1px solid rgb(255, 100, 100);
    background-color: rgb(255, 180, 180);
}

JavaScript

$('.thing').append('<div class="close">x</div>');

$('.close').live('click', function() {
    $(this).parent().slideUp();
});