Html Code: Dynamic, Animating and Stretching Border

Although borders and frames makes the contents more beautiful, simple borders are boring. Below you can find slightly stretching border. When it is hovered the stretching rate speeds up. It is beautiful!

<!-- this script got from www.htmlbestcodes.com coded by: Kerixa Inc. -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css">
<style>
html, body{
	width: 100%; height: 100%;
	background-color: #DDFFF7;
	z-index: 1;
	position: relative;
	overflow: hidden;
	
}

body{
	display: flex;
	flex-direction: row;
	justify-content: center;
	align-items:center;
	color:#fff;
}
.box{
	width: 300px; height: 200px;
	background-color: #DDFFF7;
	position: relative;
	box-shadow: 10px 10px 42px 0 rgba(0,0,0,0.75);
}
.box:after, .box:before{
	mix-blend-mode:multiply;
	filter:none;
	z-index: -1;
	content:'';
	width:calc(100% + (50px * 2));
	height:calc(100% + (50px * 2));
	position: absolute;
	display: block;
	animation: border 10s ease-in-out infinite;
	transform:translateX(-50px) translateY(-50px);
}
@keyframes border {
  0%, 100% {
    -webkit-clip-path: polygon(0 0, calc(100% - (33.3333333333px)) calc(0% + (33.3333333333px)), 100% 100%, calc(0% + (33.3333333333px)) calc(100% - (33.3333333333px)));
            clip-path: polygon(0 0, calc(100% - (33.3333333333px)) calc(0% + (33.3333333333px)), 100% 100%, calc(0% + (33.3333333333px)) calc(100% - (33.3333333333px)));
  }
  50% {
    -webkit-clip-path: polygon(calc(0% + (33.3333333333px)) calc(0% + (33.3333333333px)), 100% 0, calc(100% - (33.3333333333px)) calc(100% - (33.3333333333px)), 0 100%);
            clip-path: polygon(calc(0% + (33.3333333333px)) calc(0% + (33.3333333333px)), 100% 0, calc(100% - (33.3333333333px)) calc(100% - (33.3333333333px)), 0 100%);
  }
}

.box:after{
	animation-delay: -5s;
	background-color: #93e1d8;
	clip-path: polygon(0 0, calc(100% - (33.3333333333px)) calc(0% + (33.3333333333px)), 100% 100%, calc(0% + (33.3333333333px)) calc(100% - (33.3333333333px)));
}
.box:before {
	background-color: #AA4465;
	  clip-path: polygon(calc(0% + (33.3333333333px)) calc(0% + (33.3333333333px)), 100% 0, calc(100% - (33.3333333333px)) calc(100% - (33.3333333333px)), 0 100%);
}

.box:hover:after{
	animation-delay: -0.1s;
}
.box:hover:before, .box:hover:after {

          animation-duration: 0.2s;
}
</style>
<div class="box"></div><a target='_blank' href='http://www.htmlbestcodes.com/' style='font-size: 8pt; text-decoration: none'>HTML Codes</a>

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Html Code: Dynamic, Animating and Stretching Border

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