CSS3: Transition

a.dribbble {
    color: #ea4c89;
    text-decoration: none;
    background: #fff;
    -webkit-transition: all 0.3s ease; /* Safari, Chrome */
    -moz-transition: all 0.3s ease; /* Firefox */
    -o-transition: all 0.3s ease; /* Opera */
    transition: all 0.3s ease;
}

a.dribbble:hover {
    text-decoration: none;
    color: #fff;
    background: #353535;
}