JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
    <div class="title"></div>
</div>

CSS

.content {
    width: 500px;
    height: 500px;
    margin: 40px;
    padding: 40px;
    background: #ccc;
}

.title {
    position: relative;
    width: 300px;
    height: 50px;
    margin-left: -60px;
    background: #888;
}

.title:before,
.title:after {
    content: "";
    position: absolute;
    top: 100%;
}

.title:before {
    border-top: 20px solid #888;
    border-left: 20px solid transparent;
}

.title:after {
    left: 5px;
    border-top: 15px solid #222;
    border-left: 15px solid transparent;
}