.timeline {
    padding-top: 2rem;
    background-color: transparent;
    width: 80px;
    flex-shrink: 0;
    height: 100%;
    display: flex;
    /* align-items: center; */
    padding-left:40px;
    user-select: none;
    transition:all .3s ease-in-out;
    background: rgb(0,0,0);
    background: linear-gradient(90deg, rgba(0,0,0,0.1175420168067223) 0%, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0) 100%);
    z-index: 100000000;
}
.timeline.active {
    justify-content: start;
    padding-left:15px;
}

.timeline__inner {
    height: 90%;
    /* width: 2px; */
    /* background-color: #fff; */
}

.tl__lines {
    --line-w: 3px;
    --bg: rgba(255,255,255,0.5);
    height: 100%;
    width: var(--line-w);
    background-color: var(--bg);
    position: relative;
}

.tl__line {
    --bg: rgba(251, 242, 242, 0.8);
    --w: 12px;
    --color: var(--bg);
    background-color: var(--bg);
    width: var(--w);
    height: var(--w);
    color: var(--color);
    left: calc((var(--line-w) - var(--w)) / 2);
    border-radius: 50%;
    position: absolute;
    transition: all 0.5s ease-in-out;
    line-height: var(--w);
    transform-origin: center center;
    color: var(--bg);
    cursor: pointer;
}

.tl__line.active, .tl__line:hover {
    transform: scale(2);
    --color: #444;
}

.tl__line .tl__line__index {
    width: var(--w);
    height: var(--w);
    line-height: var(--w);
    overflow: hidden;
    color: var(--color);
    font-size: .5rem;
    text-align: center;
    transition: all 0.5s ease-in-out;
    border-radius: 50%;
    padding-top: 1px;
    /* border: 1px solid red; */
}


.ttl-title {
    /* display: none; */
    transform: scale(0);
    transform-origin: left top;
    position: absolute;
    top: .5rem;
    left: calc(100% + 1px);
    background-color:  var(--bg);
    color: #444;
    transition: transform 0.5s ease-in-out;
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    padding: 1rem;
    border-radius: 16px;
    border-top-left-radius: 0px;
    border-bottom-right-radius: 10px;
}

.tl__line:hover .ttl-title {
    transform: scale(0.5);
}