* {
	margin:0;
	padding:0;
	list-style:none;
}
h3 {
	height:150px;
	text-align:center;
	line-height:150px;
}
#helloweb {
	height: 200px;
	width:100%;
	position:relative;
}
.size {
	height: 220px;
	width:100%;
	color:#fff;
	font-size:100px;
	
	text-align:center;
	position:absolute;
	left:0;
	top:0;
}
.one {
	background-color:#ad5d5c;
	animation:one 10s linear infinite;
	-webkit-animation:one 10s linear infinite;
	-moz-webkit-animation:one 10s linear infinite;
	-o-webkit-animation:one 10s linear infinite;
}
.two {
	background-color:#845ba7;
	animation:two 10s linear infinite;
	-webkit-animation:two 10s linear infinite;
	-moz-webkit-animation:two 10s linear infinite;
	-o-webkit-animation:two 10s linear infinite;
}
.three {
	background-color:#60742d;
	animation:three 10s linear infinite;
	-webkit-animation:three 10s linear infinite;
	-moz-webkit-animation:three 10s linear infinite;
	-o-webkit-animation:three 10s linear infinite;
}
.four {
	background-color:#37839d;
	animation:four 10s linear infinite;
	-webkit-animation:four 10s linear infinite;
	-moz-webkit-animation:four 10s linear infinite;
	-o-webkit-animation:four 10s linear infinite;
}
/*第一个盒子的动画*/
@keyframes one {
	0% {
	opacity:1
}
10% {
	opacity:1
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:1
}
100% {
	opacity:1
}
}@-moz-keyframes one /* Firefox */ {
	0% {
	opacity:1
}
10% {
	opacity:1
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:1
}
100% {
	opacity:1
}
}@-webkit-keyframes one /* Safari and Chrome */ {
	0% {
	opacity:1
}
10% {
	opacity:1
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:1
}
100% {
	opacity:1
}
}@-o-keyframes one /* Opera */ {
	0% {
	opacity:1
}
10% {
	opacity:1
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:1
}
100% {
	opacity:1
}
}/*第二个盒子的动画*/
@keyframes two {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:1
}
30% {
	opacity:1
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-moz-keyframes two /* Firefox */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:1
}
30% {
	opacity:1
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-webkit-keyframes two /* Safari and Chrome */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:1
}
30% {
	opacity:1
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-o-keyframes two /* Opera */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:1
}
30% {
	opacity:1
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}/*第三个盒子的动画*/
@keyframes three {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:1
}
50% {
	opacity:1
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-moz-keyframes three /* Firefox */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:1
}
50% {
	opacity:1
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-webkit-keyframes three /* Safari and Chrome */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:1
}
50% {
	opacity:1
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-o-keyframes three/* Opera */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:1
}
50% {
	opacity:1
}
60% {
	opacity:0
}
70% {
	opacity:0
}
80% {
	opacity:0
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}/*第四个盒子的动画*/
@keyframes four {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:1
}
70% {
	opacity:1
}
80% {
	opacity:1
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-moz-keyframes four /* Firefox */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:1
}
70% {
	opacity:1
}
80% {
	opacity:1
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-webkit-keyframes four /* Safari and Chrome */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:1
}
70% {
	opacity:1
}
80% {
	opacity:1
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}@-o-keyframes four /* Opera */ {
	0% {
	opacity:0
}
10% {
	opacity:0
}
20% {
	opacity:0
}
30% {
	opacity:0
}
40% {
	opacity:0
}
50% {
	opacity:0
}
60% {
	opacity:1
}
70% {
	opacity:1
}
80% {
	opacity:1
}
90% {
	opacity:0
}
100% {
	opacity:0
}
}