:root {
    --scroll-btn-size: 40px;
    --scroll-btn-place: 40px;

}

@media screen and (max-width: 1024px) {
    :root {
        --scroll-btn-size: 30px;
        --scroll-btn-place: 35px;
    }
}

@media screen and (max-width: 900px) {
    :root {
        --scroll-btn-size: 30px;
        --scroll-btn-place: 30px;
    }
}

@media screen and (max-width: 480px) {
    :root {
        --scroll-btn-size: 30px;
        --scroll-btn-place: 25px;
    }
}

@media screen and (max-width: 320px) {
    :root {
        --scroll-btn-size: 30px;
        --scroll-btn-place: 20px;
    }
}

.scroll-top-btn {
    position: fixed;
    bottom: var(--scroll-btn-place);
    right: var(--scroll-btn-place);
    width: var(--scroll-btn-size);
    height: var(--scroll-btn-size);
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 1000;
}

.scroll-top-btn.show {
    opacity: 0.9;
    pointer-events: auto;
}

.scroll-top-btn:hover {
    background-color: #555;
    transform: scale(1.1);
}