HTML+CSS鼠标悬停效果

<link href="style.css" rel="stylesheet">

<a class="social" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-facebook"></i>
     </div>
     <div class="back">
        <i class="fa fa-facebook"></i>
     </div>
</a>

<a class="social social-twitter" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-twitter"></i>
     </div>
     <div class="back">
        <i class="fa fa-twitter"></i>
     </div>
</a>

<a class="social social-github" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-github"></i>
     </div>
     <div class="back">
        <i class="fa fa-github"></i>
     </div>
</a>

<a class="social social-pinterest" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-pinterest"></i>
     </div>
     <div class="back">
        <i class="fa fa-pinterest"></i>
     </div>
</a>

<a class="social social-googleplus" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-google-plus"></i>
     </div>
     <div class="back">
        <i class="fa fa-google-plus"></i>
     </div>
</a>

<a class="social social-skype" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-skype"></i>
     </div>
     <div class="back">
        <i class="fa fa-skype"></i>
     </div>
</a>

<a class="social social-linkedin" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-linkedin"></i>
     </div>
     <div class="back">
        <i class="fa fa-linkedin"></i>
     </div>
</a>

<a class="social social-skype" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-skype"></i>
     </div>
     <div class="back">
        <i class="fa fa-skype"></i>
     </div>
</a>

<a class="social social-dribbble" href="https://webbb.be" target="_blank">
     <div class="front">
        <i class="fa fa-dribbble"></i>
     </div>
     <div class="back">
        <i class="fa fa-dribbble"></i>
     </div>
</a>

/**
 * CSS3 social icon hover effect
 * Read more on my blog: http://webbb.be/blog/
 */

body {
    background: #f06;
    background: linear-gradient(45deg, #f06, yellow);
    min-height: 100%;
}
a,a:visited { color: #fff; }
a:hover { color: #fff; }

.social {
    float: left;
    margin: 2em 2em; width: 100px; height: 100px;     
    display: block; text-align: center; line-height:103px; color: #fff;
    
    position: relative;
    transform:rotateY(0deg);
    transition:transform .25s ease-out;
    transform-style:preserve-3d;
}
.social > div {
    width: 100px; height: 100px; background: #000;
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
}
.social >.front {
    transform:translateZ(40px);
}
.social >.back {
    background: #3B5998; font-size: 3em;
    transform:rotateY(-100deg) translateZ(40px);
}

/*  Social Media Colors 
    Facebook #3B5998
    Flickr #FE0883
    Foursquare #8FD400
    Google+ #C63D2D
    Instagram #4E433C
    Linkedin #4875B4
    Tumblr #2B4964
    Twitter #33CCFF
    Vimeo #86B32D
    Youtube #FF3333
    Dribbble #ea4c89
*/
.social.social-twitter > .back { background: #55ACEE; }
.social.social-github > .back { background: #f3f3f3; color: #000; }
.social.social-pinterest > .back { background: #e3262e; }
.social.social-googleplus > .back { background: #dd4B39; }
.social.social-skype > .back { background: #12A5F4; }
.social.social-linkedin > .back { background: #4875B4; }
.social.social-dribbble > .back { background: #ea4c89; }

/* Hover */
.social:hover {
    transform: rotateY(100deg);
}