html {
	background-color: lightpink;
}

div {
	width: 10px;
	height: 150px;
	background-color: black;
	position: relative;
	animation: mymove 1s infinite;
  	animation-timing-function: linear;
}

@keyframes mymove {
  from {top: 0px;}
  to {top: 200px;}
}

.two {
	width: 10px;
	height: 150px;
	background-color: black;
	margin-left: 20vw;
}

.third {
	width: 10px;
	height: 150px;
	background-color: black;
	margin-left: 30vw;
}

.fourth {
	width: 10px;
	height: 150px;
	background-color: black;
	margin-left: 50vw;
}

.fifth {
	width: 10px;
	height: 150px;
	background-color: black;
	margin-left: 70vw;
}

.sixth {
	width: 10px;
	height: 150px;
	background-color: black;
	margin-left: 90vw;
}