.portfolio-item {
    position: relative;
    margin: 0;
    padding-bottom: 1em;
    padding-left: 20px;
}

.portfolio-item::before {
    content: '';
    background-color: black;
    position: absolute;
    bottom: 0;
    top: 0;
    left: 6px;
    width: 3px;
}