JSFiddle - React, Tailwind, and code Playground

by Andrew Yendrizhievskiy

HTML

<h1>CSS3 Transition - Accordion sample</h1>

<section>
<div id="ave">
    <h2><a href="#ave">Ave verum</a></h2>
    <p>Ave verum corpus, natum de Maria Virgine, vere passum, immolatum in cruce pro homine,
    cuius latus perforatum unda fluxit et sanguine: esto nobis praegustatum in mortis examine.</p>
</div>

<div id="gaudeamus">
    <h2><a href="#gaudeamus">Gaudeamus</a></h2>
    <p>Gaudeamus igitur, Juvenes dum sumus!
    Post jucundam juventutem, Post molestam senectutem, Nos habebit humus!</p>
</div>

<div id="odi">
    <h2><a href="#odi">Odi et amo</a></h2>
    <p>Quare id faciam, fortasse requiris. Nescio, sed fieri sentio et excrucior.</p>
</div>
</section>

CSS

body {
    font-family: "Liberation Sans",sans-serif;
    color: #000;
    background-color: #fff;
}

h2 {
    margin: 0;
    padding: 0;
    font-size: 100%;
}

h2 a {
    color: #030;
    background-color: #cec;
    display: block;
    text-align: center;
    width: 120px;
    height: 20px;
    position: absolute;
    text-decoration: none;
    -webkit-transform: translate(-50px,50px) rotate(-90deg);
       -moz-transform: translate(-50px,50px) rotate(-90deg);
        -ms-transform: translate(-50px,50px) rotate(-90deg);
         -o-transform: translate(-50px,50px) rotate(-90deg);
            transform: translate(-50px,50px) rotate(-90deg);
}

div:target h2 a {
    color: #efd;
    background-color: #090;
}

h2 a:hover {
    color: #fff;
    background-color: #060;
}

div {
    background-color: #dfd;
    -webkit-transition: background-color 1s, width 1s;
       -moz-transition: background-color 1s, width 1s;
        -ms-transition: background-color 1s, width 1s;
         -o-transition: background-color 1s, width 1s;
            transition: background-color 1s, width 1s;
    margin: 0;
    padding: 0;
    border-top: 1px solid white;
    width: 20px;
    height: 120px;
    overflow: hidden;
    float: left;
}

div:target {
    background-color: #9f3;
    width: 400px;
}

div p {
    margin: 0;
    width: 360px;
    color: #678;
    -moz-transition: color 1s;
    -ms-transition: color 1s;
    -o-transition: color 1s;
    -webkit-transition: color 1s;
    transition: color 1s;
    padding: 10px 5px 10px 30px;

}

div:target p {
    color: #353;
}