logout button with hover and gradient

HTML

<div>Logout</div>

CSS

body {
     margin: 10px;   
}

a {
  height:50px;
  width:50px;
}

a:hover{
    background: #87e0fd; /* Old browsers */
    background: -moz-linear-gradient(top,  #87e0fd 0%, #53cbf1 40%, #05abe0 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#87e0fd), color-stop(40%,#53cbf1), color-stop(100%,#05abe0)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top,  #87e0fd 0%,#53cbf1 40%,#05abe0 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top,  #87e0fd 0%,#53cbf1 40%,#05abe0 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top,  #87e0fd 0%,#53cbf1 40%,#05abe0 100%); /* IE10+ */
    background: linear-gradient(top,  #87e0fd 0%,#53cbf1 40%,#05abe0 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#87e0fd', endColorstr='#05abe0',GradientType=0 ); /* IE6-9 */

}