.button-back-to-bottom  {
    width:50px;
    height:50px;
    background: black;
    position: fixed;
    right: 30px;
    display:none;
    z-index:10000;
}
.arrow {
    text-decoration: none;
    width:100%;
    height:100%;
    display: block;
    -webkit-transition: margin 0.3s;
    -moz-transition: margin 0.3s;
    -o-transition: margin 0.3s;
    transition: margin 0.3s;
}
a.back-to-top-white {
    background: url("../images/white.gif") no-repeat scroll center center rgba(0, 0, 0, 0);
    background-size: 70% 70%;
}
a.back-to-top-black {
    background: url("../images/black.gif") no-repeat scroll center center rgba(0, 0, 0, 0);
    background-size: 70% 70%;
}
a.back-to-bottom-white {
    background: url("../images/white.gif") no-repeat scroll center center rgba(0, 0, 0, 0);
    background-size: 70% 70%;
    transform:rotate(180deg);
    -ms-transform:rotate(180deg);
    -webkit-transform:rotate(180deg);
}
a.back-to-bottom-black {
    background: url("../images/black.gif") no-repeat scroll center center rgba(0, 0, 0, 0);
    background-size: 70% 70%;
    transform:rotate(180deg);
    -ms-transform:rotate(180deg);
    -webkit-transform:rotate(180deg);
}
div.opacity-hover:hover {
    opacity:0.7 !important;
}
div.button-back-to-bottom.move-hover:hover a.bottom_arrow {
    margin:2px 0;
}
div.button-back-to-bottom.move-hover:hover a.top_arrow {
    margin:-2px 0;
}
a.scroll-up.btn.btn-primary {
    display:none !important;
}