JSFiddle - React, Tailwind, and code Playground

HTML

<div>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta id cumque tempore cupiditate quod nihil aspernatur animi dolorem ipsa voluptate non deserunt officiis eum ut deleniti ratione sunt minus qui.</div>

CSS

div {
    width: 400px;
    background-color: #F1F1F1;
    padding: 40px 30px 35px;
    position: relative;
    box-sizing: border-box; /* Для удобства включаем отступы в размер блока*/
}
div:before,
div:after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;  
}

div:before {
    left: 0;
    bottom: 0;
    border-top: 20px solid #F1F1F0;
    border-right: 200px solid #999;
    border-bottom: 0px solid transparent;
    border-left: 200px solid #999;
}