*{
 	margin: 0;
 	padding: 0;
 }

 body{
 	background:url("../images/bg.jpg");
 	background-size: cover;
 	overflow: hidden;
 }

 .bird{
 	background:url("../images/bird.png");
 	width: 130px;
 	height: 175px;
 	position: absolute;
 }

 .bird-1{
 	top: 5%;
 	left: -10%;
 	animation: birdFly 1s steps(10) infinite, birdMove 15s linear infinite; 	
 }

.bird-2{
 	top: 20%;
 	left: -10%;
 	animation: birdFly 1s steps(10) infinite, birdMove 15s linear infinite; 	
 	animation-delay:3s;
 }

 .bird-3{
 	top: 2%;
 	left: -10%;
 	animation: birdFly 1s steps(10) infinite, birdMove 15s linear infinite;
 	animation-delay:5s;
 }
 

 @keyframes birdFly{
 	0%{
 		background-position-x: 0px;
	}

 	100%{
		background-position-x: 1305px;
	}

}


@keyframes birdMove{
	0%{
		left: -10%;
	}

	100%{
		left: 110%;
	}

}