#backToTop {
    position: fixed;
    bottom: 50px;
    right: 50px;
    width: 50px;
    height: 50px;
    background-color: white;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: opacity 0.5s ease;
}

#backToTop.show {
    opacity: 1;
}

#backToTop.hide {
    opacity: 0;
    cursor: none;
    pointer-events: none;
}

.triangle {
    width: 0;
    height: 0;
    border-left: 13px solid transparent;
    border-right: 13px solid transparent;
    border-bottom: 20px solid green;
}