._scroll_y {
    position: fixed;
    top: 0;
    right: 3px;
    width: 6px;
    height: 0vh;
    z-index: 9999;
    border-radius: 10px;
}

._scroll_y div {
    width: 100%;
    height: 0;
    border-radius: 10px;
    background: black;
    opacity: 0;
    position: relative;
    transition: opacity 0.3s ease;
    cursor: grab;
}