.fix-btn-box {
    position: fixed;
    z-index: 203;
    top: 30px;
    right: 50px;
    transition: var(--TransitionDefault);
    height: var(--NaviHeight);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fix-btn a {
    border: none;
    background: var(--LightLinearGradient);
    color: #fff;
    font-weight: 400;
    font-size: var(--FontSizeNavi);
    padding: 8px 20px;
    width: auto;
    height: var(--BtnHeight);
    text-align: center;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50px;
}


.fix-btn-box.is-up {
    transition: var(--TransitionDefault);
    top: 0;
    right: 30px;
}


.fix-btn img {
    width: 20px;
    margin-right: 8px;
    filter: contrast(0) brightness(2);
}


@media (hover: hover) and (pointer: fine),
(min-width: 1200px) {

    .fix-btn-box.is-up a:hover,
    .fix-btn a:hover {
        color: var(--BtnPrimaryHoverTextColor);
        background: var(--BtnPrimaryHoverBg);
    }

    .fix-btn a:hover img {
        filter: invert(1) brightness(3);
    }

}

@media (max-width: 650px) {

    .fix-btn-box,
    .fix-btn-box.is-up {
        right: 0;
        width: 100%;
        bottom: 0;
        top: unset;
    }

    .fix-btn-box .RWDbase,
    .fix-btn {
        width: 100%;
    }

    .fix-btn-box {
        height: auto;
    }
}