.top-button{
    display: inline-block;
    width: 50px;
    height: 50px;
    padding: 8px 0;
    position: fixed;
    bottom: 25px;
    right: 15px;
    color: #ffffff;
    text-align: center;
    text-decoration: none;
    line-height: 1.2;
    z-index: 100;
    
    -webkit-transition: all 0.17s cubic-bezier(0.000, 0.000, 0.580, 1.000);  
    -moz-transition: all 0.17s cubic-bezier(0.000, 0.000, 0.580, 1.000); 
    -o-transition: all 0.17s cubic-bezier(0.000, 0.000, 0.580, 1.000);
    -ms-transition: all 0.17s cubic-bezier(0.000, 0.000, 0.580, 1.000); 
    transition: all 0.17s cubic-bezier(0.000, 0.000, 0.580, 1.000);
    
}
.top-button:before{
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 2px;
    left: 0;
    background: rgba(0,0,0, .2);
    
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
}
.top-button:hover,
.top-button:focus{
    color: #ffffff;
    text-decoration: none;
    
    -moz-transform: scale(1.2);
    -webkit-transform: scale(1.2);
    -o-transform: scale(1.2);
    -ms-transform: scale(1.2);
    transform: scale(1.2);    
}
.top-button i{
    position: relative;
    left: 0px;
}
.top-button span{
    display: block;
    position: relative;
    margin-top: 1px;
    font-size: 11px;
    letter-spacing: 1px;
    font-weight: bold;
    text-transform: uppercase;
}