header {
    z-index: 2;
}
#header_helper__middle-view_scroll_up,
#header_helper__middle-view_scroll_down {
    padding: 10px;
    width: 60px;
    height: 40px;
    background-color: rgb(45, 217, 255);
    border-radius: 0 0 40px 40px;
    display: flex;
    justify-content: center;
    margin: auto;
    left: 0;
    right: 0;
    cursor: pointer;
}
#header_helper__middle-view_scroll_up {
    position: fixed;
    top: 0;
    z-index: 1;
}
#header_helper__middle-view_scroll_down {
    position: absolute;
    bottom: -40px;
}
.header_helper__middle-view_scroll_up_img,
.header_helper__middle-view_scroll_down_img {
    background: none;
}
.header_helper__middle-view_scroll_down_img {
    transform: rotate(180deg);
}