:root {
	text-shadow: 0 0 .3em white, 0 0 .3em white, 0 0 .4em white, 0 0 .5em white, 0 0 .6em white, 0 0 1em white, 0 0 1em white, 0 0 1em white, 0 0 1em white;
}
video {
	position: fixed;
	z-index: -1;
	margin: auto;
	top: 0;
	left: 0;
	max-width: 100vw;
	max-height: 100vh;
}
input:valid {
	border-radius: .2em;
	border: 1px solid lime;
}
input:user-invalid {
	border-radius: .2em;
	border: 1px solid red;
}