<svg xmlns='http://www.w3.org/2000/svg' viewbox='0 0 40 40' preserveAspectRatio='none'>
<style>
		rect, path {
			fill: none;
			stroke: #000;
			stroke-width: 1px;
			vector-effect: non-scaling-stroke;
			stroke-dasharray: 4px;
			animation: stroke 0.2s linear infinite;
			shape-rendering: geometricPrecision;
			stroke-dashoffset: 8px;
		}

		@keyframes stroke {
			to {
				stroke-dashoffset: 0;
			}
		}
	</style>
	<path d='M 20,20 L 40,40'/>
	<path d='M 20,20 L 00,40'/>
	<path d='M 20,20 L 40,0'/>
	<path d='M 20,20 L 0,0'/>
	<rect width='40' height='40'/>
</svg>

svg {
	display: block;
	width: 50vw;
	height: 50vh;
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	margin: auto;
	overflow: visible;
}