.cd-top {
    z-index: 999;
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    -webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    /* image replacement properties */
    overflow: hidden;
    white-space: nowrap;
    background-color: rgba(232, 98, 86, 0.8);
    visibility: hidden;
    opacity: 0;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
    transition: opacity .3s 0s, visibility 0s .3s, background-color .3s 0s;
}

    .cd-top.cd-top--show,
    .cd-top.cd-top--fade-out,
    .cd-top:hover {
        -webkit-transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
        transition: opacity .3s 0s, visibility 0s 0s, background-color .3s 0s;
    }

    .cd-top.cd-top--show {
        /* the button becomes visible */
        visibility: visible;
        opacity: 1;
        cursor: pointer;
        margin-bottom: 30px;
    }

    .cd-top.cd-top--fade-out {
        /* if the user keeps scrolling down, the button is out of focus and becomes less visible */
        opacity: .5;
    }

    .cd-top:hover {
        /*background-color: #e5381d;*/
        opacity: 1;
    }

    .cd-top i {
        position: absolute;
        left: 0;
        top: 0;
        margin: auto;
        font-size: 30px;
        padding: 5px;
        color: #fff;
    }


@media only screen and (min-width: 768px) {
    .cd-top {
        right: 20px;
        bottom: 20px;
    }
}

@media only screen and (min-width: 1024px) {
    .cd-top {
        right: 25px;
        bottom: 25px;
    }
}

@media (max-width:641px) {
    .cd-top {
        right: 20px;
        bottom: 20px;
        border-radius: 50%;
    }

        .cd-top.cd-top--show {
            margin-bottom: 0px;
            margin-left:4px;
            margin-right:4px;
        }
}