<style>
body {
    position: relative;
    background: white;
}

div {
    position: absolute;
    z-index: -1;
    transform: translateZ(0);
}

.green {
    background-color: green;
    width: 200px;
    height: 200px;
}
</style>
<body>
<div class="green"></div>
<div></div>