<style>
element.style {
    display: block;
}
#back-top {
    bottom: 50px;
    opacity: 0.75;
    position: fixed;
    right: 10px;
}
p {
    margin: 5px auto;
    text-indent: 0;
}
#back-top span {
    -moz-transition: all 1s ease 0s;
    background: url("https://images.cnblogs.com/cnblogs_com/gtts/291912/r_Upload1.png") no-repeat scroll center center #EFEAD4;
    border-radius: 15px 15px 15px 15px;
    display: block;
    height: 108px;
    margin-bottom: 7px;
    width: 108px;
}
#back-top a:hover span{background-color:#C49368;}
a:link {
    color: #000;
    text-decoration: none;
}
#back-top a {
    -moz-transition: all 1s ease 0s;
    display: block;
    width: 108px;
}
</style>