JSFiddle - React, Tailwind, and code Playground

by vvv vvvv

HTML

<div id="menu">

    <ul id="tag">
        <li><a href="#">Un truc</a></li>
        <li><a href="#">Un autre</a></li>
        <li><a href="#">Machin</a></li>
        <li><a href="#">Voilà</a></li>
    </ul>

    <ul id="bubble">
        <li><div></div>Un commentaire très pertinent</li>
        <li><div></div>Un commentaire très pertinent</li>
        <li><div></div>Un commentaire très pertinent</li>
        <li><div></div>Un commentaire très pertinent</li>
    </ul>

</div>

CSS

body {
    padding: 25px;
    font-family: Helvetica, Arial, sans-serif;
    font-size: 16px;
}

a {
    color: inherit;
    text-decoration: none;
}

#menu { position: relative; }
ul#bubble { position: absolute; top: 0; left: 0; }

#menu li {
    padding: 10px;
    height: 70px;
    line-height: 70px; /*Uniquement si texte court*/
}

    #menu li + li { margin-top: 5px; }

ul#tag li {
    width: 70px;
    background-color: #DC143C;
    color: #fff;
    text-align: center;
}

ul#bubble li {
    position: relative;
    margin-left: 146px;
    border-right: 4px solid rgba(220, 20, 60, 0.05);
    width: 250px;
    background-color: #FFF5FE;
    font-size: 0.9em;
}

ul#bubble li div {
    position: absolute;
    top: 0;
    left: 0;
    margin: 0 0 0 -90px;
    padding: 0;
    height: 0;
    width: 0;
    border: 45px solid #FFF5FE;
    border-top-color: transparent;
    border-bottom-color: transparent;
    border-left-color: transparent;
}