#MonthOfCode - Day 21: wave

My entry for the 21st day of the month of code. The theme for today is: wave.

Code after the break. 

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<div id="moc-21">
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
  <div></div><div></div><div></div><div></div><div></div>
</div>
wave.cssview raw
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#moc-21 {
  margin: 20px 0;
  width: 100%;
  height: 160px;
}

#moc-21 > div {
  width: 2%;
  height: 10px;
  background-color: #bada55;
  float: left;

  -webkit-animation: wave 1s infinite ease-in-out alternate;
}

#moc-21 > div:nth-child(10n) {
  -webkit-animation-delay: 0.0s;
}
#moc-21 > div:nth-child(10n+1) {
  -webkit-animation-delay: 0.2s;
}
#moc-21 > div:nth-child(10n+2) {
  -webkit-animation-delay: 0.4s;
}
#moc-21 > div:nth-child(10n+3) {
  -webkit-animation-delay: 0.6s;
}
#moc-21 > div:nth-child(10n+4) {
  -webkit-animation-delay: 0.8s;
}
#moc-21 > div:nth-child(10n+5) {
  -webkit-animation-delay: 1s;
}
#moc-21 > div:nth-child(10n+6) {
  -webkit-animation-delay: 1.2s;
}
#moc-21 > div:nth-child(10n+7) {
  -webkit-animation-delay: 1.4s;
}
#moc-21 > div:nth-child(10n+8) {
  -webkit-animation-delay: 1.6s;
}
#moc-21 > div:nth-child(10n+9) {
  -webkit-animation-delay: 1.8s;
}


@-webkit-keyframes wave {
  from {
    margin-top: 0;
  }
  to {
    margin-top: 100px;
  }
}