.page-top {
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: hidden;
    opacity: 0;
    position: fixed;
    right: 20px;
    bottom: 60px;
    z-index: 100;
    width: 80px;
    height: 40px;
    padding: 0;
    border: none;
    border: solid 1px #dadada;
    border-radius: 5px;
    background-color: #ffffff;
    outline: none;
    cursor: pointer;
    transition: all .3s ease-out;

    appearance: none;
}

.is-fadein {
    visibility: visible;
    opacity: 1;
}

.page-top::before {
    transform: rotate(-45deg);
    width: 12px;
    height: 12px;
    margin-bottom: -8px;
    border-top: solid 2px #dadada;
    border-right: solid 2px #dadada;
    content: "";
}

.page-top:hover {
    transform: scale(1.05);
}

@media screen and (max-width:479px) {
    .page-top {
        bottom: 20px;
        transform: scale(.8);
    }
}