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HTML 

              
                <!--
Credit to https://codepen.io/pedro-castro
-->
<section class="cd-slider">
  <ul>
    <li data-color="#FF384B">
      <div class="content" >
        <blockquote>
          <p>GET $100 BILL CREDIT, TODAY</p>
          <span>When you sign up to Origin Maximiser - that's $50 for electricity and $50 for natural gas. On a 12 month plan with a great discount. Online only.</span><br><br><br>
<button class="c-button c-button--purple" type="button">
  <div class="c-ripple js-ripple">
    <span class="c-ripple__circle"></span>
  </div>
  SWITCH TODAY
</button>
        </blockquote>

      </div>
    </li>
    <li data-color="#FF9C00">
      <div class="content" style="background-image:url()">
        <blockquote>
          <p>MOVING HOUSE?</p>
          <span>Let's make it quick, so your power is sorted in minutes.

</span><br><span>
<button class="btn eff focus">SWITCH TODAY</button></span>

        </blockquote>
      </div>
    </li>
    <li data-color="#002AFF">
      <div class="content" style="background-image:url()">
        <blockquote>
          <p>Fixed Energy Bill</p>
          <span>Pay the same amount for your electricity or natural gas for 12 months - 
no price hikes, no nasty surprises.

</span><br>
<button class="btn eff focus">SWITCH TODAY</button>

        </blockquote>
      </div>
    </li>
  </ul>
  <nav>
    <div><a class="prev" href="#"></a></div>
    <div><a class="next" href="#"></a></div>
  </nav>
</section>
!

CSS 

              
                info {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 9999999;
  margin: 1.5rem;
}
@import url(https://fonts.googleapis.com/css?family=Montserrat:700);
*, *::before, *::after {
	box-sizing: border-box;
	padding: 0;
	margin: 0;
	border: 0;
}
html {
	font-size: 10px;
	font-size: calc(5px + 0.4vw);
}
body {
	font-family: 'Montserrat', sans-serif;
  font-weight: 700;
	font-size: 1rem;
	color: #fff;
}
a {
  text-decoration: none;
  color: rgba(225, 255, 255, .8);
}
/* Slider style */
.cd-slider {
	position: relative;
	width: 100%;
	height: 100vh;
	overflow: hidden;
}
.cd-slider.ie9 nav div span {
	display: none;
}
.cd-slider ul li {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	visibility: hidden;
	-webkit-transition: visibility 0s .6s;
	transition: visibility 0s .6s;
}
.cd-slider ul li::before {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	border-radius: 100%;
	width: 135vh;
	height: 135vh;
	border: solid rgba(0,0,0,0.2);
	border-width: 0;
	-webkit-transform: translate(-50%, -50%);
	        transform: translate(-50%, -50%);
	pointer-events: none;
	-webkit-transition: border-width .4s .6s;
	transition: border-width .4s .6s;
}
.content {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-position: 50% 100%;
	background-size: auto 100%;
	background-repeat: no-repeat;
	mix-blend-mode: lighten;
	opacity: 0;
	-webkit-transform: scale(1.2);
	        transform: scale(1.2);
	-webkit-transition: opacity .4s .6s, -webkit-transform .4s .6s;
	transition: opacity .4s .6s, -webkit-transform .4s .6s;
	transition: opacity .4s .6s, transform .4s .6s;
	transition: opacity .4s .6s, transform .4s .6s, -webkit-transform .4s .6s;
}
.content blockquote {
	position: absolute;
	width: 100%;
	height: 100%;
	top: 10%;
	left: 17%;
	z-index: 2;
	max-width: 45%;
}
blockquote p {
	font-size: 8rem;
	margin-bottom: 2rem;
}
blockquote span {
	font-size: 2.4rem;
}
/* current slide
---------------------------------*/
.cd-slider li.current_slide {
	visibility: visible;
}
.cd-slider li.current_slide::before {
	border-width: 16rem;
}
.cd-slider li.current_slide .content {
	opacity: 1;
	-webkit-transform: scale(1);
	        transform: scale(1);
}
/* nav
---------------------------------*/
nav div {
	position: absolute;
	top: 50%;
	left: 4%;
	width: 5rem;
	height: 5rem;
	margin-top: -2.5rem;
	list-style: none;
}
nav div:last-of-type {
	left: auto;
	right: 4%;
}
.prev, .next {
	position: relative;
	z-index: 100;
	width: 100%;
	height: 100%;
	display: block;
	border-radius: 100%;
	-webkit-transition: box-shadow .3s;
	transition: box-shadow .3s;
}
.prev::before, .prev::after, .next::before, .next::after {
	content: '';
	position: absolute;
	left: 43%;
	background: #fff;
	width: .4rem;
	min-width: 3px;
	border-radius: 3px;
	height: 34%;
}
.prev::before {
	-webkit-transform: rotate(45deg);
	        transform: rotate(45deg);
	top: 24%;
}
.prev::after {
	-webkit-transform: rotate(-45deg);
	        transform: rotate(-45deg);
	bottom: 24%;
}
.next::before, .next::after {
	left: auto;
	right: 43%;
}
.next::before {
	-webkit-transform: rotate(-45deg);
	        transform: rotate(-45deg);
	top: 24%;
}
.next::after {
	-webkit-transform: rotate(45deg);
	        transform: rotate(45deg);
	bottom: 24%;
}
.prev:hover, .next:hover {
	box-shadow: 0 0 0 1rem rgba(0, 0, 0, 0.15);
}
nav > div > span {
	position: absolute;
	top: 50%;
	left: 50%;
	width: 0;
	height: 0;
	border-radius: 100%;
	z-index: 5;
	pointer-events: none;
	will-change: width, height;
	-webkit-transform: translate(-50%, -50%);
	        transform: translate(-50%, -50%);
	-webkit-transition: width .6s, height .6s;
	transition: width .6s, height .6s;
}






@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,300);
@import url(https://fonts.googleapis.com/css?family=Roboto:400,300);


* {
  box-sizing: border-box;
}



.btn {
  background: #E53935;
  border-radius: 3px;
  border: 0;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.05);
  color: #fff;
  cursor: pointer;
  display: inline-block;
  font-size: 14px;
  font-weight: 400;
  margin: 10px;
  padding: 12px 35px;
  text-decoration: none;
  transition: all 0.3s ease;
}
.btn.btn-link {
  background: transparent;
  box-shadow: none;
  color: #222;
}
.btn.btn-link circle {
  fill: rgba(0, 0, 0, 0.08);
}
.btn.btn-link:hover, .btn.btn-link:active {
  background: transparent;
}
.btn.btn-link:focus:before {
  background: rgba(0, 0, 0, 0.1);
}
.btn.focus, .btn:focus {
  outline: none;
}
.btn.focus:before, .btn:focus:before {
  transition: all 0.7s ease;
  content: "";
  position: absolute;
  background: rgba(255, 255, 255, 0.2);
  z-index: 99;
  left: 15%;
  right: 15%;
  top: -50%;
  bottom: -50%;
  border-radius: 200%;
  -webkit-animation: pulse ease 1.4s infinite;
}
.btn:active, .btn:hover {
  background: #F44336;
}
.btn:active:before, .btn:hover:before {
  opacity: 0;
  left: -10%;
  right: -10%;
}

.eff {
  position: relative;
  overflow: hidden;
}
.eff svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.eff circle {
  fill: rgba(255, 255, 255, 0);
}

@-webkit-keyframes pulse {
  from {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  to {
    transform: scale(1);
  }
}






/**
 * Component: Button
 * --------------------------------------------------
 */
.c-button {
  -webkit-appearance: none;
  position: relative;
  display: inline-block;
  padding: 12px 24px;
  margin: 0;
  vertical-align: middle;
  overflow: visible;
  color: #fff;
  font: inherit;
  font-size: 14px;
  line-height: 20px;
  font-weight: 400;
  text-align: center;
  letter-spacing: 1px;
  background: transparent;
  border: 0;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  box-shadow: 2px 2px 0 0 #383e46;
  -webkit-transition: all 0.2s ease;
  transition: all 0.2s ease;
}
.c-button:hover, .c-button:focus {
  outline: 0;
  text-decoration: none;
}
.c-button:not(:disabled) {
  cursor: pointer;
}

/**
 * Mixin: Button Modifier
 * --------------------------------------------------
 */
/**
 * Component: Button
 * Modifier: Purple
 * --------------------------------------------------
 */
.c-button--purple {
  background: gray;
  text-shadow: 2px 2px 0 #7652d1;
}
.c-button--purple:hover {
  background: #8666d7;
}

/**
 * Component: Button
 * Modifier: Blue
 * --------------------------------------------------
 */
.c-button--blue {
  background: #4A89DC;
  text-shadow: 2px 2px 0 #276ecc;
}
.c-button--blue:hover {
  background: #357bd8;
}

/**
 * Component: Button
 * Modifier: Red
 * --------------------------------------------------
 */
.c-button--red {
  background: #E9573F;
  text-shadow: 2px 2px 0 #dc3519;
}
.c-button--red:hover {
  background: #e64328;
}

/**
 * Utility: Ripple
 * --------------------------------------------------
 */
.c-ripple {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: transparent;
}

.c-ripple__circle {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  opacity: 0;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
}
.c-ripple.is-active .c-ripple__circle {
  -webkit-animation: a-ripple .4s ease-in;
          animation: a-ripple .4s ease-in;
}

/**
 * Animation: Ripple
 * --------------------------------------------------
 */
@-webkit-keyframes a-ripple {
  0% {
    opacity: 0;
  }
  25% {
    opacity: 1;
  }
  100% {
    width: 200%;
    padding-bottom: 200%;
    opacity: 0;
  }
}
@keyframes a-ripple {
  0% {
    opacity: 0;
  }
  25% {
    opacity: 1;
  }
  100% {
    width: 200%;
    padding-bottom: 200%;
    opacity: 0;
  }
}
!

JS 

              
                (function() {
	var cdSlider = document.querySelector('.cd-slider'),
		item = cdSlider.querySelectorAll("li"),
		nav = cdSlider.querySelector("nav");

	item[0].className = "current_slide";

	for (var i = 0, len = item.length; i < len; i++) {
		var color = item[i].getAttribute("data-color");
		item[i].style.backgroundColor=color;
	}

	// Detect IE
	// hide ripple effect on IE9
	var ua = window.navigator.userAgent;
		var msie = ua.indexOf("MSIE");
		if ( msie > 0 ) {
			var version = parseInt(ua.substring(msie+ 5, ua.indexOf(".", msie)));
			if (version === 9) { cdSlider.className = "cd-slider ie9";}
	}

	if (item.length <= 1) {
		nav.style.display = "none";
	}

	function prevSlide() {
		var currentSlide = cdSlider.querySelector("li.current_slide"),
			prevElement = currentSlide.previousElementSibling,
			prevSlide = ( prevElement !== null) ? prevElement : item[item.length-1],
			prevColor = prevSlide.getAttribute("data-color"),
			el = document.createElement('span');

		currentSlide.className = "";
		prevSlide.className = "current_slide";

		nav.children[0].appendChild(el);

		var size = ( cdSlider.clientWidth >= cdSlider.clientHeight ) ? cdSlider.clientWidth*2 : cdSlider.clientHeight*2,
		    ripple = nav.children[0].querySelector("span");

		ripple.style.height = size + 'px';
		ripple.style.width = size + 'px';
		ripple.style.backgroundColor = prevColor;

		ripple.addEventListener("webkitTransitionEnd", function() {
			if (this.parentNode) {
				this.parentNode.removeChild(this);
			}
		});

		ripple.addEventListener("transitionend", function() {
			if (this.parentNode) {
				this.parentNode.removeChild(this);
			}
		});

	}

	function nextSlide() {
		var currentSlide = cdSlider.querySelector("li.current_slide"),
			nextElement = currentSlide.nextElementSibling,
			nextSlide = ( nextElement !== null ) ? nextElement : item[0],
			nextColor = nextSlide.getAttribute("data-color"),
			el = document.createElement('span');

		currentSlide.className = "";
		nextSlide.className = "current_slide";

		nav.children[1].appendChild(el);

		var size = ( cdSlider.clientWidth >= cdSlider.clientHeight ) ? cdSlider.clientWidth*2 : cdSlider.clientHeight*2,
			  ripple = nav.children[1].querySelector("span");

		ripple.style.height = size + 'px';
		ripple.style.width = size + 'px';
		ripple.style.backgroundColor = nextColor;

		ripple.addEventListener("webkitTransitionEnd", function() {
			if (this.parentNode) {
				this.parentNode.removeChild(this);
			}
		});

		ripple.addEventListener("transitionend", function() {
			if (this.parentNode) {
				this.parentNode.removeChild(this);
			}
		});

	}

	updateNavColor();

	function updateNavColor () {
		var currentSlide = cdSlider.querySelector("li.current_slide");

		var nextColor = ( currentSlide.nextElementSibling !== null ) ? currentSlide.nextElementSibling.getAttribute("data-color") : item[0].getAttribute("data-color");
		var	prevColor = ( currentSlide.previousElementSibling !== null ) ? currentSlide.previousElementSibling.getAttribute("data-color") : item[item.length-1].getAttribute("data-color");

		if (item.length > 2) {
			nav.querySelector(".prev").style.backgroundColor = prevColor;
			nav.querySelector(".next").style.backgroundColor = nextColor;
		}
	}

	nav.querySelector(".next").addEventListener('click', function(event) {
		event.preventDefault();
		nextSlide();
		updateNavColor();
	});

	nav.querySelector(".prev").addEventListener("click", function(event) {
		event.preventDefault();
		prevSlide();
		updateNavColor();
	});

})();
!
999px

Console