.cd-top {
    display: inline-block;
    height: 60px;
    width: 60px;
    border-radius: 100px;
    position: fixed;
    bottom: 30px;
    right: 40px;
    z-index: 1000;
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    background: url('https://nashmuc.com/backtotop/images/arrow-up.svg') no-repeat center;
    background-size: 50%;
    background-color: var(--primary);
    filter: brightness(1);
    visibility: hidden;
    opacity: 0;
    transition: opacity .3s, visibility 0s .3s, background-color .3s, filter .3s;
}

.cd-top.cd-is-visible,
.cd-top.cd-fade-out {
    transition: opacity .3s, visibility 0s 0s;
}

.cd-top.cd-is-visible {
    visibility: visible;
    opacity: 0.8;
}

.cd-top.cd-fade-out {
    opacity: 0.8;
}

.cd-top:hover {
    opacity: 1;
    filter: brightness(0.85);
}

@media only screen and (min-width: 768px) {
    .cd-top {
        bottom: 40px;
        height: 55px;
        width: 55px;
    }
}

@media only screen and (min-width: 1024px) {
    .cd-top {
        bottom: 50px;
        height: 60px;
        width: 60px;
    }
}