.fix-btn-box {
    position: fixed;
    z-index: 203;
    transition: var(--TransitionEase);
    display: flex;
    align-items: center;
    justify-content: center;
    right: 15px;
    bottom: 50%;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(5px);
    width: 50px;
}

.fix-btn a {
    border: var(--BorderPx1);
    background: var(--BtnOutlineBg);
    color: var(--BtnOutlineColor);
    font-weight: 400;
    font-size: var(--FontSizeNavi);
    padding: 1.2rem 10px;
    width: 50px;
    text-align: center;
    letter-spacing: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-lr;
    -webkit-writing-mode: vertical-lr;
    align-content: center;
    flex-direction: row;
    gap: 0 1.2rem;
    font-family: var(--FontFamilyTw);
}

.fix-btn-box.is-up .fix-btn a {
    border: var(--BorderPx1);
    background: var(--BtnOutlineBg);
    color: var(--BtnOutlineColor);
}

.fix-btn-box.is-up {
    transition: var(--TransitionEase);
}

.fix-btn img {
    width: 19px;
}




@media (hover:hover) {

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

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


/* fix-btn */
@media (max-width: 991px) {

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

    .fix-btn img {
        filter: brightness(0) invert(1);
        transform: rotate(-90deg);
    }

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


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

    .fix-btn-box .fix-btn a,
    .fix-btn-box.is-up .fix-btn a {
        background: #212121;
        border: 0;
        color: var(--BtnColor);
    }
}


@media (max-width: 991px) {
    .fix-btn-box {
        bottom: 0;
        left: 0;
        right: auto;
        width: 100%;
        opacity: 0;
    }

    .fix-btn-box.is-up {
        opacity: 1;
    }

    .fix-btn a {
        width: 100%;
        -webkit-writing-mode: initial;
        writing-mode: initial;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}