JSFiddle - React, Tailwind, and code Playground

HTML

<div class="green">asd<br> dsdsd <br> dasd</div>
<div class="red">asd<br> dsdsd <br> dasd</div>

CSS

div {
    float: left;
    width: 50%;
    text-align: center;
}

.red {
    background: red;
    position: relative;
}

.red:before {
    content: "";
    display: block;
    height: 80%;
    width: 1px;
    background: #000000;
    position: absolute;
    top: 10%;
    left: 10px;
}

.green {
    background: green;
}