encody · July 6, 2016 12:43
diff --git a/button.css b/button.css
 /*
    Video Guide: https://youtu.be/QI2rDHQM5Pc
 */

 body {
    background-color: #333;
 }

 button {
    font-family: "Roboto";
    font-size: 24px;
    padding: 1em 2em;
    margin: 3px;
    border: 0;
    outline: 0;
    color: white;
    background-color: #2196F3;
    text-transform: uppercase;
    border-radius: 0.15em;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);

    overflow: hidden;
    position: relative;
    
    /*
        Not discussed in tutorial; this ensures that the ripple
        circle doesn't go over the border-radius of the button
    */
    z-index: 1;
 }

 button .ripple {
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.7);
    position: absolute;
    transform: scale(0);
    animation: ripple 0.6s linear;
 }

 @keyframes ripple {
    to {
        transform: scale(2.5);
        opacity: 0;
    }
 }
diff --git a/button.js b/button.js
 /*
    Video Guide: https://youtu.be/QI2rDHQM5Pc
    
    Note: You may want to wrap this code in a self-executing
    anonymous function to prevent globals from being created:
    
    (function () {
        ...
    })();
 */

 var buttons = document.getElementsByTagName('button');

 Array.prototype.forEach.call(buttons, function (b) {
    b.addEventListener('click', createRipple);
 });

 function createRipple (e) {
    /*
        Note that these next two lines will create a
        NEW ripple element for each click. If this is
        undesirable behavior, try:
        
        * Setting a timeout to delete the element
        * Checking if an element has already been made & reuse it
        * Create an element around line 8 and always reuse it
        * etc.
    */
    var circle = document.createElement('div');
    this.appendChild(circle);

    var d = Math.max(this.clientWidth, this.clientHeight);

    circle.style.width = circle.style.height = d + 'px';

    circle.style.left = e.clientX - this.offsetLeft - d / 2 + 'px';
    circle.style.top = e.clientY - this.offsetTop - d / 2 + 'px';

    circle.classList.add('ripple');
 }
diff --git a/index.html b/index.html
 <!--
    Video Guide: https://youtu.be/QI2rDHQM5Pc
 -->
 <!DOCTYPE html>
 <html>
    <head>
        <meta charset="utf-8">
        <title>Button Ripple</title>
        <link rel="stylesheet" href="button.css">
        <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
    </head>
    <body>
        <button>
            Click Me!
        </button>
        <button>
            Click Me!
        </button>
        <button>
            Click Me!
        </button>

        <script src="button.js"></script>
    </body>
 </html>
	/*
	Video Guide: https://youtu.be/QI2rDHQM5Pc
	*/

	body {
	background-color: #333;
	}

	button {
	font-family: "Roboto";
	font-size: 24px;
	padding: 1em 2em;
	margin: 3px;
	border: 0;
	outline: 0;
	color: white;
	background-color: #2196F3;
	text-transform: uppercase;
	border-radius: 0.15em;
	box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);

	overflow: hidden;
	position: relative;

	/*
	Not discussed in tutorial; this ensures that the ripple
	circle doesn't go over the border-radius of the button
	*/
	z-index: 1;
	}

	button .ripple {
	border-radius: 50%;
	background-color: rgba(255, 255, 255, 0.7);
	position: absolute;
	transform: scale(0);
	animation: ripple 0.6s linear;
	}

	@keyframes ripple {
	to {
	transform: scale(2.5);
	opacity: 0;
	}
	}
	/*
	Video Guide: https://youtu.be/QI2rDHQM5Pc

	Note: You may want to wrap this code in a self-executing
	anonymous function to prevent globals from being created:

	(function () {
	...
	})();
	*/

	var buttons = document.getElementsByTagName('button');

	Array.prototype.forEach.call(buttons, function (b) {
	b.addEventListener('click', createRipple);
	});

	function createRipple (e) {
	/*
	Note that these next two lines will create a
	NEW ripple element for each click. If this is
	undesirable behavior, try:

	* Setting a timeout to delete the element
	* Checking if an element has already been made & reuse it
	* Create an element around line 8 and always reuse it
	* etc.
	*/
	var circle = document.createElement('div');
	this.appendChild(circle);

	var d = Math.max(this.clientWidth, this.clientHeight);

	circle.style.width = circle.style.height = d + 'px';

	circle.style.left = e.clientX - this.offsetLeft - d / 2 + 'px';
	circle.style.top = e.clientY - this.offsetTop - d / 2 + 'px';

	circle.classList.add('ripple');
	}
	<!--
	Video Guide: https://youtu.be/QI2rDHQM5Pc
	-->
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Button Ripple</title>
	<link rel="stylesheet" href="button.css">
	<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
	</head>
	<body>
	<button>
	Click Me!
	</button>
	<button>
	Click Me!
	</button>
	<button>
	Click Me!
	</button>

	<script src="button.js"></script>
	</body>
	</html>