JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bubble bubble-left"></div>

CSS

body {
    background-color: black;
}

.bubble {
    position: relative;
    width: 80px;
    height: 160px;
    border: 1px solid #33A7F4;
    border-radius: 9px;
    margin: 100px;
    -webkit-box-shadow: 0px 0px 20px 2px #33A7F4;
    -moz-box-shadow: 0px 0px 20px 2px #33A7F4;
    -ms-box-shadow: 0px 0px 20px 2px #33A7F4;
    -o-box-shadow: 0px 0px 20px 2px #33A7F4;
    box-shadow: 0px 0px 20px 2px #33A7F4;

}

.bubble:after, .bubble:before {
    content: ' ';
    position: absolute;
    width: 0;
    height: 0;
    border: 17px solid transparent;
    right: 100%;
}

.bubble-left:before {
    border-top-color: #33A7F4;
    border-right-color: #33A7F4;
    top: 60px;
}

.bubble-left:after {
    border-width: 16px;
    border-top-color: black;
    border-right-color: black;
    top: 61px;
}