The Marathon wiki

table.timeline {
    box-shadow: none;
    font-size: 0.875rem;
}

table.timeline, table.timeline tbody {
    display: block;
}

table.timeline tr {
    position: relative;
    margin-left: 8px;
    padding: 0.5rem 0.5rem 0.5rem 20px;
    display: flex;
    flex-direction: column;
    border-top-right-radius: 1rem;
    border-bottom-right-radius: 1rem;
}

table.timeline tr:before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: -1px;
    display: block;
    width: 2px;
    background-color: #333333;
}

table.timeline tr td:first-child {
    font-size: 1rem;
    font-weight: bold;
}

table.timeline tr td:first-child:before {
    content: "";
    width: 8px;
    height: 8px;
    display: block;
    background-color: #53ED24;
    border-radius: 100%;
    position: absolute;
    left: -4px;
    margin-top: 8px;
}

table.timeline tr td {
    padding: 0;
    border: 0 !important;
}