<!DOCTYPE html>
<style>
body {
zoom: 2;
margin: 0;
}
div {
-webkit-mask-box-image: -webkit-linear-gradient(left,
transparent, transparent 10px, black 10px,
black 90px, transparent 90px, transparent);
background: linear-gradient(0deg, green, green);
width: 100px;
height: 100px;
}
</style>
<div></div>