html {
  height: 100vh;
}

body {
	background: url(https://unsplash.it/1920/1680/?random);
	background-size: cover;
	background-repeat: no-repeat;
  font-family:'Roboto';
}

button {
	width: 200px;
	height: 50px;
	margin: 10px;
	background: rgba(0,0,0,.8);
	color: #fff;
	border: none;
	transition: all .5s;
}

button:hover {
	box-shadow: 0 0 15px black;
	text-shadow: 0 0 15px white;
}