.timeline {
    position: relative;
    padding: 20px 0;
    list-style: none;
    max-width: 1200px;
    margin: 0 auto;
}

    .timeline:before {
        content: " ";
        position: absolute;
        top: 0;
        bottom: 0;
        left: 50%;
        width: 3px;
        margin-left: -1.5px;
        background-color: #e9ecef;
    }

    .timeline > .timeline-item {
        position: relative;
        margin-bottom: 20px;
    }

        .timeline > .timeline-item:after,
        .timeline > .timeline-item:before {
            content: " ";
            display: table;
        }

        .timeline > .timeline-item:after {
            clear: both;
        }

        .timeline > .timeline-item > .timeline-panel {
            float: left;
            position: relative;
            width: 46%;
            padding: 10px;
            border: 1px solid #e9ecef;
            border-radius: 2px;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.05);
        }

            .timeline > .timeline-item > .timeline-panel:before {
                content: " ";
                display: inline-block;
                position: absolute;
                top: 26px;
                right: -8px;
                border-color: transparent #e9ecef;
                border-style: solid;
                border-width: 8px 0 8px 8px;
            }

            .timeline > .timeline-item > .timeline-panel:after {
                content: " ";
                display: inline-block;
                position: absolute;
                top: 27px;
                right: -7px;
                border-color: transparent #fff;
                border-style: solid;
                border-width: 7px 0 7px 7px;
            }

        .timeline > .timeline-item > .timeline-badge {
            position: absolute;
            top: 16px;
            left: 50%;
            width: 30px;
            height: 30px;
            margin-left: -25px;
            border-radius: 50% 50% 50% 50%;
            text-align: center;
            font-size: 1em;
            line-height: 30px;
            color: #fff;
            overflow: hidden;
        }

        .timeline > .timeline-item.timeline-inverted > .timeline-panel {
            float: right;
        }

            .timeline > .timeline-item.timeline-inverted > .timeline-panel:before {
                right: auto;
                left: -8px;
                border-right-width: 8px;
                border-left-width: 0;
            }

            .timeline > .timeline-item.timeline-inverted > .timeline-panel:after {
                right: auto;
                left: -7px;
                border-right-width: 7px;
                border-left-width: 0;
            }

.timeline-badge.signed {
    background-color: #28a745;
}

.timeline-badge.invalidate {
    background-color: #6c757d;
}

.timeline-body > p,
.timeline-body > ul {
    margin-bottom: 0;
}

.timeline-left:before {
    left: 20px;
}

.timeline-left > .timeline-item > .timeline-badge {
    left: 30px;
    top: 20px;
}

.timeline-left > .timeline-item > .timeline-panel {
    width: calc(100% - 45px);
}