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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

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To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                	<main>
		<div id="switch-container">
			<button id="switch" class="switch-off">OFF</button>
		</div>
	</main>

	<!-- Link to jquery -->
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>

	<script src="js/switch.js"></script>
!

CSS 

              
                /* base background colour */
body {
	background: #000;
	transition: background-color 0.50s ease 0s;
}
 /* switch on background colour */
.body-on {
	background: #fff;
}

#switch-container {
	width: 500px;
	height: 250px;
	margin-right: auto;
	margin-left: auto;
	border: none;
	/* default (off) button color */
	background: #2C3E50;
	/* set up background animation */
	transition: background-color 0.50s ease 0s;
}

#switch {
	height: 250px;
	width: 250px;
	border: none;
	outline: none;
	font-size: 100px;
	font-family: 'Open Sans', sans-serif;
	font-weight: 300;
	color: #ECF0F1;

	/* Set up the animation properties */
   transition: transform 0.25s linear 0s,
   		background 0.25s ease 0s,
		border-radius 0.25s ease 0s,
		box-shadow 0.25s ease 0s;
}

.switch-off {
	transform: translateX(0px);
	background: #E74C3C;
	border-radius: 0 50% 50% 0;
	box-shadow: 7px 0px 8px -4px rgba(0,0,0,0.54);
}

.switch-on {
	transform: translateX(250px);
	background: #96CA2D;
	border-radius: 50% 0 0 50%;
	box-shadow: -7px 0px 8px -4px rgba(0,0,0,0.54);
}

/* background colour for on */
#switch-container.background-on {
	background: #2980B9;
}
!

JS 

              
                $(document).ready(function() {
	// when the switch is clicked...
  function switchOff() {
    $('.switch-off').on('click', function() {
      // change off class to on
      $(this).removeClass('switch-off');
      $(this).addClass('switch-on');
      // change the button text
      $(this).html('ON');
      // change switch container background color to 'on';
      $('#switch-container').addClass('background-on');
      //change body background color
      $('body').addClass('body-on');
      // call the switchOn function which will fire up the event listener for the on button
      switchOn();
    });
  }
  
  function switchOn() {
    $('.switch-on').on('click', function() {
      $(this).removeClass('switch-on');
      $(this).addClass('switch-off');
      $(this).html('OFF');
      $('#switch-container').removeClass('background-on');
      $('body').removeClass('body-on');
      switchOff();
    });
  }
  // when the document is ready, call the switchOff function
  switchOff();
	
});
!
999px

Console