CODE EXAMPLE FOR HTML

how to make vertical line html

.left-content {
    width: 50%;
    align-self: flex-end;
    position: relative;
}

.left-content::after {
    content: "";
    background-color: black;
    position: absolute;
    width: 10px;
    height: 57%;
    top: 0px;
    left: 0px;
    margin: 0 -30px;



}