JSFiddle - React, Tailwind, and code Playground

HTML

<div class="balao">
    ECONOMIZE <br />
    100%
</div>

CSS

.balao {
    background:blue;
    padding:10px;
    color:#fff;
    display:inline-block;
    position:relative;
}
.balao:before {
    content:'';
    position:absolute;
    left:-10px;
    top:0;
    border-bottom: 10px solid transparent;
    border-right:10px solid blue;
}
body {
    margin:50px;
}