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<!DOCTYPE html>
<html>
<head>
<style>
.scene {
transform-style: preserve-3d;
}
.hidden {
backface-visibility: hidden;
}
#inner {
width: 20px;
height: 20px;
box-shadow: rgb(255, 205, 31) 0px 0px 0px 3px;
}
</style>
</head>
<body>
<div class="scene">
<div class="hidden">
<div id="inner">
</div>
</div>
</div
</body>