.slide-up-down {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.4s ease;
}

.slide-up-down.show {
    max-height: 500px; /* 충분히 큰 값 설정 */
    opacity: 1;
}

.popup-fade-in-out {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.popup-fade-in-out.show {
    opacity: 1;
    visibility: visible;
}

.btn-top {
    position: fixed;
    right: 20px;
    bottom: 100px;
    display: none;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.btn-top.show {
    display: block;
    opacity: 1;
}