.button-bar__top-button{
    opacity: 0.6;
    width: 50px;
    height: 50px;
    float: right;
    background-color: transparent;
    border: none;
    line-height: 50px;
    text-align: center;
    vertical-align: middle;
    display: none;
    color: #ccc;
    background-image: url(../images/top_grey.svg);
    background-repeat: no-repeat;
    background-position: center center;
    z-index:9999; 
    position:fixed; 
    bottom:5px; 
    right:400px;
}