JSFiddle - React, Tailwind, and code Playground

by Luis Manuel

HTML

<div class="rectangle"></div>

SCSS

$blue: lighten(blue,25%);

.rectangle{
    width: 200px;
    height: 50px;
    background-color: $blue;
    position: relative;
    /*left: 50%;
    transform: translateX(-50%);*/
    margin: 0 auto;
    border: 1px darken($blue,5%) solid;
}

.rectangle::before{
    content: "";
    width: 0;
    height: 0;
    display: block;
    position: absolute;
    z-index: -1;
    border-left: 25px solid transparent;
    border-right: 25px solid $blue;
    border-top: 25px solid $blue;
    border-bottom: 25px solid $blue;
    left: -30px;
    top: 10%;
}