#scroll-to-top-btn {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 80;
    border: none;
    outline: none;
    background-color: #E78C0B;
    color: white;
    cursor: pointer;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    font-size: 24px;
    transition: opacity 0.3s, visibility 0.3s, transform .3s linear;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

#scroll-to-top-btn:hover {
    transform: scale(1.13);
}

.arrow-up {
    display: inline-block;
    font-weight: bold;
}