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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Quicksand:300,400,500,700" rel="stylesheet">
	<div class="warning">
		This page uses <a href="https://css-tricks.com/snippets/css/complete-guide-grid/" title="CSS Grid Layout" target="_blank">CSS Grid Layout</a>. If you are reading this message, your browser does not support this feature and you may not be able to see a grid of example boxes. You can check the browser compatibility <a href="http://caniuse.com/#feat=css-grid" title="Can I Use CSS Grid Layout" target="_blank">here</a>.
	</div>
	<h1>Simple Animations using CSS Borders</h1>
	<h3>Hover your mouse on the examples below to see the effect.</h3>
	<div class="grid-container">
		<div>
			<h2>1. Interchange border colors</h2>
			<div class="box box1"></div>
		</div>
		<div>
			<h2>2. Expand width</h2>
			<div class="box box2"></div>
		</div>
		<div>
			<h2>3. Expand width &amp; height</h2>
			<div class="box box3"></div>
		</div>
		<div>
			<h2>4. Rotate border colors using keyframe animations</h2>
			<div class="box box4"></div>
		</div>
		<div>
			<h2>5. Four colored circle</h2>
			<div class="box box5"></div>
		</div>
		<div>
			<h2>6. Two colored triangle</h2>
			<div class="box box6"></div>
		</div>
		<div>
			<h2>7. Two colored square</h2>
			<div class="box box7"></div>
		</div>
		<div>
			<h2>8. Missing top border</h2>
			<div class="box box8"></div>
		</div>
		<div>
			<h2>9. Down Arrow</h2>
			<div class="box box9"></div>
		</div>
		<div>
			<h2>10. Left Arrow</h2>
			<div class="box box10"></div>
		</div>
		<div>
			<h2>11. Up Arrow</h2>
			<div class="box box11"></div>
		</div>
		<div>
			<h2>12. Right Arrow</h2>
			<div class="box box12"></div>
		</div>
	</div>

	<footer>
		<a href="https://github.com/mpsinghk/animations-using-css-borders" title="Fork on GitHub" target="_blank">Fork on GitHub</a>
	</footer>
!

CSS 

              
                /* Base
------------------------------------------------------- */
body {
  font-family: 'Quicksand', sans-serif;
  font-size: calc(16px + 0.3vw);
  font-weight: 300;
  line-height: 1.4;
  text-align: center;
  padding: 40px 30px 30px;
}

/* Typography
------------------------------------------------------- */
h1 {
  font-size: 3.2em;
  line-height: 1.1;
  font-weight: 700;
  margin: 0 0 0.3em;
}

h2 {
  font-size: 1.2em;
  line-height: 1.3;
  font-weight: 400;
  margin: 0 0 0.8em;
}

a,
a:hover,
a:focus {
  text-decoration: none;
  color: #00a7e3;
}

/* Footer
------------------------------------------------------- */
footer {
  font-size: 0.9em;
  padding: 20px;
  margin-top: 50px;
  border-top: 1px solid #ccc;
}

/* CSS Grid Layout
------------------------------------------------------- */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  grid-gap: 20px;
}

.grid-container > div {
  border: 1px solid #ccc;
  padding: 30px;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

/* Warning message if using old browser
that does not support CSS Grid Layout.
------------------------------------------------------- */
.warning {
  padding: 20px;
  margin-bottom: 30px;
  background: #f7b563;
  border: 1px solid #e88d1a;
  border-radius: 3px;
}

.warning a {
  color: #fff;
}

@supports (display: grid) {
  .warning {
    display: none;
  }
}

/* Example boxes
------------------------------------------------------- */
.box {
  display: inline-block;
  cursor: pointer;
  width: 100px;
  height: 100px;
  border-width: 35px;
  border-style: solid;
  border-color: cyan magenta yellow black;
  -webkit-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
}

.box1:hover,
.box1:focus {
  border-color: yellow black cyan magenta;
}

.box2 {
  width: 0;
}

.box2:hover,
.box2:focus {
  width: 100px;
}

.box3 {
  width: 0;
  height: 0;
}

.box3:hover,
.box3:focus {
  width: 100px;
  height: 100px;
}

@-webkit-keyframes rotate-borders {
  25% { border-color: black cyan magenta yellow; }
  50% { border-color: yellow black cyan magenta; }
  75% { border-color: magenta yellow black cyan; }
  100% { border-color: cyan magenta yellow black; }
}

@keyframes rotate-borders {
  25% { border-color: black cyan magenta yellow; }
  50% { border-color: yellow black cyan magenta; }
  75% { border-color: magenta yellow black cyan; }
  100% { border-color: cyan magenta yellow black; }
}

.box4 {
  -webkit-animation: rotate-borders 6s infinite;
          animation: rotate-borders 6s infinite;
}

.box5:hover,
.box5:focus {
  border-radius: 50%;
}

.box6:hover,
.box6:focus {
  width: 0;
  height: 0;
  border-width: 85px;
  border-color: transparent magenta yellow transparent;
}

.box7:hover,
.box7:focus {
  width: 0;
  height: 0;
  border-width: 0 170px 170px 0;
  border-color: transparent magenta yellow transparent;
}

.box8:hover,
.box8:focus {
  width: 0;
  height: 0;
  border-width: 85px;
  border-color: transparent magenta yellow black;
}

.box9:hover,
.box9:focus {
  width: 0;
  height: 0;
  border-width: 170px 85px 0 85px;
  border-color: cyan transparent transparent transparent;
}

.box10:hover,
.box10:focus {
  width: 0;
  height: 0;
  border-width: 85px 170px 85px 0;
  border-color: transparent magenta transparent transparent;
}

.box11:hover,
.box11:focus {
  width: 0;
  height: 0;
  border-width: 0 85px 170px 85px;
  border-color: transparent transparent yellow transparent;
}

.box12:hover,
.box12:focus {
  width: 0;
  height: 0;
  border-width: 85px 0 85px 170px;
  border-color: transparent transparent transparent black;
}
!

JS 

              
                // Find me on Instagram
// https://www.instagram.com/mpsinghk
!
999px

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