JSFiddle - React, Tailwind, and code Playground

HTML

<div class="app-cont"><div class="app-head">Additional Comments :</div><div class="app-main">balallalalalallalalalala<br/>jaslnflkasnlsnlksanlknslnwkin<br />lknlkanfklnlk</div></div>

CSS

div {
    color:white;
}
.app-cont {
    background: black;
    width: 90%;
    padding-top: 2.5px;
    padding-bottom: 2.5px;
    margin-bottom: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
}
.app-head {
    background: #484848;
    width: 25%;
    margin-bottom: auto;
    display: inline-block;
    border-top-right-radius:2px;
    -moz-border-top-right-radius:2px;
    border-bottom-right-radius:2px;
    -moz-border-bottom-right-radius:2px;
    vertical-align:middle;
}
.app-main {
    display: inline-block;
    text-align: justify;
    vertical-align:middle;
}