.cn-timeline-item-tail {
    position: absolute;
    inset-block-start: 10px;
    inset-inline-start: 0.45rem;
    height: 100%;
    border-inline-start: 2px solid var(--cn-border-design-separator-0);
}
.cn-timeline-item-tail-col {
    position: absolute;
    width: 100%;
    height: 2px;
    top: 0.65rem;
    --un-bg-opacity:1;background-color:rgb(var(--cn-colors-gray-400) / var(--un-bg-opacity));
}