<style>
.card {
width: 200px;
height: 200px;
margin: 10px auto;
position: relative;
}
.card__panel {
border: 1px solid black;
background: blue;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
</style>
<div class="card">
<div class="card__panel card__panel--front">
</div>
<div class="card__panel card__panel--inside-left">
</div>
<div class="card__panel card__panel--inside-right">
</div>
</div>
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.