JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap-events">
        <div class="events">
            <a href="#">
                <img src="http://www.cg-auto.com.br/forum/imagens/imagens_news/26c4dc4359edcfd4c6871ee1fa958539.jpg" alt="image">
            </a>
            <div class="caption">
                <p>This is a caption</p>
            </div>
        </div>
    </div>
    <button id="slide">Slide It!</button>

CSS

img {
        border: 0;  
    }

    a {
        text-decoration: none;  
    }

    .wrap-events {
        float: left;
        position: relative;
        width: 500px;
        height: 250px;
    }

    .events {
        overflow: hidden;

        -webkit-border-radius: 50px;
        -moz-border-radius: 50px;
        border-radius: 50px;
    }

    .caption {
        position: absolute;
        width: 100%;
        bottom: 0;
        color: #FFFFFF;
        background-color: #151515;
        font: 12px "Arial", Helvetica, sans-serif;

        opacity: 0.6;

        border-radius: 0 0 50px 50px; /* add border-radius to caption */
    }

    .caption p {
        padding: 10px;
    }

JavaScript

$('#slide').click(function(){
            $('.caption').hide().fadeIn(2000);
        });