JSFiddle - React, Tailwind, and code Playground

HTML

<div class="rectangle"  align="center">
    Дистанции огромного размера
</div>
<div class="center" align="center">
    <div class="triangle"></div>
</div>

CSS

body {background: #150F04;}
.rectangle {
    height: 60px;
    background: #679FC2;
    border: 5px solid #BBE1F9;
    position: relative;
    margin-top: 100px;
    color: #fff;
    padding-top: 40px;
}
.triangle {position: relative;width: 50px;}
.trianle:after {
    content: ''; 
    position: absolute;
    left: -25px;
    bottom: 105px;
    border: 50px solid transparent;
    border-bottom: 50px solid #679FC2;
}
.triangle:before {
    content: ''; 
    position: absolute;
    left: -33px;
    bottom: 105px;
    border: 58px solid transparent;
    border-bottom: 58px solid #BBE1F9;
}