.rn-progress-parent {
    position: fixed;
    right: 30px;
    bottom: 30px;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    border-radius: 50px;
    box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.2);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.rn-progress-parent.rn-backto-top-active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.rn-progress-parent::after {
    position: absolute;
    content: '↑';
    text-align: center;
    line-height: 46px;
    font-size: 24px;
    color: #000;
    left: 0;
    top: 0;
    height: 46px;
    width: 46px;
    cursor: pointer;
    display: block;
    z-index: 1;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.rn-progress-parent:hover::after {
    color: #fff;
}

.rn-progress-parent::before {
    position: absolute;
    content: '';
    background-color: #000;
    width: 100%;
    height: 100%;
    display: block;
    border-radius: 50%;
    transform: scale(0);
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.rn-progress-parent:hover::before {
    transform: scale(1);
}

.rn-progress-parent svg path {
    fill: none;
}

.rn-progress-parent svg.rn-back-circle path {
    stroke: #000;
    stroke-width: 4;
    box-sizing: border-box;
    -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}