We could implement some fancy effects by CSS3. There is a very good tutorial written by Joshua Johnson about some mouse hover effects in CSS3.
Joshua Johnson – Four Simple and Fun CSS Button Hover Effects for Beginners
The following example is a growing button which will elongate in width when mouse hover.
<!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;
}
#button1 {
/* Basic CSS */
background: #6292c2;
border: 2px solid #eee;
height: 28px;
width: 115px;
margin: 50px 0 0 50px;
padding: 0 0 0 7px;
overflow: hidden;
display: block;
/* Rounded Corners */
-webkit-border-radius: 15px; /* Chrome & Safari */
-moz-border-radius: 15px; /* Firefox */
-khtml-border-radius: 15px; /* Linux browsers */
border-radius: 15px; /* CSS3 */
/* Gradient */
background-image: -webkit-linear-gradient(top,rgba(0,0,0,0),rgba(0,0,0,0.2));
background-image: -moz-linear-gradient(top,rgba(0,0,0,0),rgba(0,0,0,0.2));
background-image: -o-linear-gradient(top,rgba(0,0,0,0),rgba(0,0,0,0.2));
background-image: -ms-linear-gradient(top,rgba(0,0,0,0),rgba(0,0,0,0.2));
background-image: linear-gradient(top,rgba(0,0,0,0),rgba(0,0,0,0.2));
/* Transition */
-webkit-transition: All 0.5s ease;
-moz-transition: All 0.5s ease;
-o-transition: All 0.5s ease;
-ms-transition: All 0.5s ease;
transition: All 0.5s ease;
}
#button1:hover {
width: 200px;
}
</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='button1' class='buttonText'>Sign Up Now - It's Free!</a>
</body>
</html>
Kudos to Joshua Johnson for his great examples.
Done =)
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Reference: Joshua Johnson – Four Simple and Fun CSS Button Hover Effects for Beginners
Eureka! 
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