<header>  
  <h1>Animation @keyframes in Image Hovers</h1>
    <a href="http://webdesignerwall.com/tutorials/easy-css-animation-using-keyframes" target="_blank">View Tutorial</a>
</header>

<div class="main">
	  <div class="column">
			<figure><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/927610/wolf.jpg" /></figure>
		</div>
		<div class="column">
			<figure><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/927610/lion.jpg" /></figure>
		</div>
		<div class="column">
			<figure><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/927610/tiger.jpg" /></figure>
		</div>
</div>
html{
    height: 100%;
    width: 100%;
    overflow: hidden;
}
body{
  background: linear-gradient(90deg, #b9deed, #efefef);
  margin: 0;
  padding: 0;
}

.main{
  display: flex;
  flex-flow: row wrap;
  width: 100%;
  justify-content: center;
}
.column{
  flex-basis: 1 10px;
  width: calc(100% / 3 - 10px);
  margin: 5px;
  padding: 0;
}
figure {
	position: relative; 
  overflow: hidden;
  margin: 0;
  height: 100%;
  width: 100%;
  filter: grayscale(.8);
}
figure img{
  width: 100%;
  height: 100%;
}
figure::before {
	position: absolute;
	top: 50%;
	left: 50%;
	z-index: 2;
	display: block;
	content: '';
	width: 0;
	height: 0;
	background: rgba(0,0,0,.2);
	border-radius: 100%;
	transform: translate(-50%, -50%);
	opacity: 0;
}
figure:hover{
  animation: bloom ease-in-out .75s forwards;
}
figure:hover::before {
	animation: circle .75s;
}
@keyframes bloom {
	0% {
		filter: grayscale(.8);
	}
	40% {
		filter: grayscale(.5);
	}
	100% {
		filter: grayscale(0);
	}
}
@keyframes circle {
	0% {
		opacity: .5;
    background: rgba(213,156,34,.2);
    
	}
	40% {
		opacity: 1;
    background: rgba(213,34,160,.2);
	}
	100% {
		width: 200%;
		height: 200%;
		opacity: 0;
	}
}

/* General style */
header{
  width: 100%;
  display: block;
  background: #FFF;
  height: 40px;
  margin-bottom: 4%;
  color: #ccc;
  font-family: sans-serif;
  font-weight: bold;
  box-shadow: 0px 2px 0px 0px rgba(125,121,125,0.3);
  overflow: hidden;
}
header h1, header a{
  display: inline-block;
  font-size: .8rem;
  margin: auto 10px;
  line-height: 40px;

}
header h1{
    text-transform: uppercase;
    letter-spacing: 1px;
}
header a{
  text-decoration: none;
  background-color: #eee;
  color: #999;
  padding: 0 20px;
  transition: all ease-in-out .3s;
}
header a:hover{
  background-color: #93dfec;
  color: #eee;
  margin-left: -3px;
}
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