Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<style id="jsbin-css">
@-webkit-keyframes left {
  0% {
    height: 20px;
    top: 30px;
  }
  30% {
    height: 80px;
    top: 0;
  }
  100% {
    height: 100%;
    top: 0;
  }
}

@-webkit-keyframes top {
  100% {
    width: 200px;
  }
}

@-webkit-keyframes bottom {
  100% {
    width: 200px;
  }
}

@-webkit-keyframes right {
  100% {
    height: 100%;
  }
}

#test {
  width: 200px;
  height: 300px;
  background: purple;
  position: relative;
}

#test .content {
  width: calc(100% - 4px);
  height: calc(100% - 4px);
  display: inline-block;
  background: pink;
  margin: 2px;
}

.border {
  display: inline-block;
  position: absolute;
  background: yellow;
}

.left {
  width: 2px;
  height: 20px;
  top: 30px;
  left: 0;
}

#test:hover .left {
  animation: left 1s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

.top {
  width: 0px;
  height: 2px;
  top: 0;
  left: 0;
}

#test:hover .top {
  animation: top 0.7s 0.3s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

.right {
  width: 2px;
  height: 0px;
  top: 0;
  right: 0;
}

#test:hover .right {
  animation: right 1s 1s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

.bottom {
  width: 0px;
  height: 2px;
  bottom: 0;
  left: 0;
}

#test:hover .bottom {
  animation: bottom 1s 1s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

body {
  background: #fff;
}
</style>
</head>
<body>
<div id="test">
  <div class="top border"></div>
  <div class="left border"></div>
  <div class="right border"></div>
  <div class="bottom border"></div>
  <div class="content"></div>
</div>


<script id="jsbin-source-css" type="text/css">@-webkit-keyframes left {
  0% {
    height: 20px;
    top: 30px;
  }
  30% {
    height: 80px;
    top: 0;
  }
  100% {
    height: 100%;
    top: 0;
  }
}

@-webkit-keyframes top {
  100% {
    width: 200px;
  }
}

@-webkit-keyframes bottom {
  100% {
    width: 200px;
  }
}

@-webkit-keyframes right {
  100% {
    height: 100%;
  }
}

#test {
  width: 200px;
  height: 300px;
  background: purple;
  position: relative;
}

#test .content {
  width: calc(100% - 4px);
  height: calc(100% - 4px);
  display: inline-block;
  background: pink;
  margin: 2px;
}

.border {
  display: inline-block;
  position: absolute;
  background: yellow;
}

.left {
  width: 2px;
  height: 20px;
  top: 30px;
  left: 0;
}

#test:hover .left {
  animation: left 1s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

.top {
  width: 0px;
  height: 2px;
  top: 0;
  left: 0;
}

#test:hover .top {
  animation: top 0.7s 0.3s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

.right {
  width: 2px;
  height: 0px;
  top: 0;
  right: 0;
}

#test:hover .right {
  animation: right 1s 1s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

.bottom {
  width: 0px;
  height: 2px;
  bottom: 0;
  left: 0;
}

#test:hover .bottom {
  animation: bottom 1s 1s 1 linear;
  -webkit-animation-fill-mode: forwards;
}

body {
  background: #fff;
}
</script>
</body>
</html>