// css-anim-congratz
div{margin:25px auto; width:700px;}
span{width:20px; height:10px;display:block;border-radius:10px;
float:left;}

span:nth-child(2n-1){background:red; animation:bar1 0.8s infinite ease;}

span:nth-child(2n){background:yellow;animation:bar2 0.8s infinite ease;}

@keyframes bar1{
0%{background:red}100%{background:yellow}
}

@keyframes bar2{
0%{background:yellow}100%{background:red}
}

h2{clear:both;padding-top:15px; padding-left:15px;font-family:verdana;

font-size:1.25em;}