<span class="marker"><span class="marker"><span class="marker">
    consectetur adipiscing elit. Nam at sem eu ligula porttitor iaculis volutpat
    non lacus.
</span></span></span>

.marker {
    background: #f77;
    padding: 3px 0;
    position: relative;
    left: -10px;
    line-height: 30px;
}

.marker .marker { left: 20px; }

.marker .marker .marker { left: -10px; }