​x
 
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<!DOCTYPE html>
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<title>Example</title>
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<style>
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.animatedBox {
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  width: 200px;
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  padding: 5px;
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  text-align: center;
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  font: 24px sans-serif;
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  color: white;
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  background: yellowgreen;
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  animation: myAnimation 1s ease 1s 5 alternate forwards;
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}
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​
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@keyframes myAnimation {
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  100% {
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    padding-bottom: 50px;
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  }
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}
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</style>
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​
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<div class="animatedBox">Animated box</div>