scrolltotop.css

/*--------------------------------------------------------------------------
          Styles for the scroll to top button
 --------------------------------------------------------------------------*/
@keyframes scroll-top-bounce {
    0%,
    20%,
    60%,
    100% {
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    40% {
        -webkit-transform: translateY(-4px);
        transform: translateY(-4px);
    }
    80% {
        -webkit-transform: translateY(-2px);
        transform: translateY(-2px);
    }
}

.scroll-top .scroll-top-button {
    position: fixed;
    bottom: 0;
    right: 0;
    left: 0;
    background: #fff;
    -webkit-border-top-left-radius: 8px;
    -moz-border-top-left-radius: 8px;
    border-top-left-radius: 8px;
    -webkit-border-top-right-radius: 8px;
    -moz-border-top-right-radius: 8px;
    border-top-right-radius: 8px;
    font-size: 16px;
}

@media only screen and (max-width: 768px) {
    .scroll-top .scroll-top-button .scroll-top-text {
        display: none;
    }

    .scroll-top .scroll-top-button .scroll-top-arrow {
        left: 48%;
        right: auto;
        -webkit-animation: scroll-top-bounce 2s infinite;
        -moz-animation: scroll-top-bounce 2s infinite;
        -o-animation: scroll-top-bounce 2s infinite;
        animation: scroll-top-bounce 2s infinite;
    }
}

@media only screen and (min-width: 768px) {
    .scroll-top .scroll-top-button {
        width: 48px;
        height: 48px;
        padding: 2px 16px;
        right: auto;
        left: 48%;
        color: #000;
    }

    .scroll-top .scroll-top-button .scroll-top-arrow {
        padding-top: 8px;
    }

    .scroll-top .scroll-top-button .scroll-top-text {
        opacity: 0;
    }

    .scroll-top .scroll-top-button:hover {
        -webkit-transition: .5s;
        -moz-transition: .5s;
        -o-transition: .5s;
        -ms-transition: .5s;
        transition: .5s;
        width: 150px;
        width: 150px;
        left: 45%;
    }

    .scroll-top .scroll-top-button:hover .scroll-top-text {
        opacity: 1;
        font-size: 16px;
        padding-left: 12px;
    }

    .scroll-top .scroll-top-button:hover .scroll-top-arrow {
        -webkit-animation: scroll-top-bounce 1s;
        -moz-animation: scroll-top-bounce 1s;
        -o-animation: scroll-top-bounce 1s;
        animation: scroll-top-bounce 1s;
    }
}