.navi_content_container {
    position: absolute;
    width: 200px;
}
.ce_navi_content {
    position: absolute;
    display: none;
    left: 0;
    right: 0;
    top: 0;
    height: 200px;
    opacity: 0;
    z-index: 0;
    transition: all 0.3s;
}
#menu.open .ce_navi_content {
    display: block;
}
.ce_navi_content.active {
    opacity: 1;
    z-index: 500;
}