<style>
.green-box {
height: 400px;
width: 400px;
clip-path: inset(0 200px 200px 0);
}
</style>
<body>
<div>
<svg class="green-box" viewBox="0 0 200 200">
<rect width="100%" height="100%" fill="green"/>
</svg>
</div>
</body>