JSFiddle - React, Tailwind, and code Playground

HTML

<div class="zadatak">Eliminacijski zadatak</div>

CSS

.zadatak{
    border-bottom: solid 1px #000;
    border-left:1px solid #000;
    width:150px;
    height:20px;
    /*text-align:right;*/
    position:absolute;
    top:45px;
    left:50px;
    padding-left:100px;
}

.zadatak:before {
    border-radius: 30px;
    width: 40px;
    height: 40px;
    background: #fff;
    border: 1px solid #000;
    color: #000;
    text-align: center;
    line-height:40px;
    position:absolute;
    top:0px;
    left:30px;
    content:"1.";
}

.zadatak:after {
	width: 0; 
	height: 0; 
	border-top: 10px solid transparent;
	border-bottom: 10px solid transparent;
	border-left: 10px solid #000;
}