The 3rd example by is a background shift effect. This effect manipulate the background-position attribute.
Again, thanks Joshua Johnson for his great examples.
Joshua Johnson – Four Simple and Fun CSS Button Hover Effects for Beginners
You can use the following image bkg-1.jpg as the button background.
Complete example.
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Design Shack Button Examples by Joshua Johnson</title>
<style media='screen' type='text/css'>
a.buttonText {
color: white;
text-decoration: none;
font: 18px/1.5 Helvetica,Arial,sans-serif;
}
#button3 {
/* Basic CSS */
background: transparent url('bkg-1.jpg');
background-position: 0 0;
text-shadow: 0px 2px 0px rgba(0, 0, 0, 0.3);
font-size: 22px;
height: 58px;
width: 155px;
margin: 50px 0 0 50px;
overflow: hidden;
display: block;
text-align: center;
line-height: 58px;
/* Rounded Corners */
-webkit-border-radius: 5px; /* Chrome & Safari */
-moz-border-radius: 5px; /* Firefox */
-khtml-border-radius: 5px; /* Linux browsers */
border-radius: 5px; /* CSS3 */
/* Shadow */
-webkit-box-shadow: 0px 3px 1px rgba(0, 0, 0, 0.2);
-moz-box-shadow: 0px 3px 1px rgba(0, 0, 0, 0.2);
box-shadow: 0px 3px 1px rgba(0, 0, 0, 0.2);
/* Transition */
-webkit-transition: All 0.8s ease;
-moz-transition: All 0.8s ease;
-o-transition: All 0.8s ease;
-ms-transition: All 0.8s ease;
transition: All 0.8s ease;
}
#button3:hover {
background-position: 0 150px;
}
</style>
</head>
<body>
<p>Tutorial by Joshua Johnson. <a href='http://designshack.net/articles/css/four-simple-and-fun-css-button-hover-effects-for-beginners/'>View original example</a></p>
<a href='#' id='button3' class='buttonText'>Sign Up Now</a>
</body>
</html>
Done =)
Next:
Reference: Joshua Johnson – Four Simple and Fun CSS Button Hover Effects for Beginners
Eureka! 
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