JSFiddle - React, Tailwind, and code Playground

HTML

<div class="rectangle">
    <p class="txt">Vertically aligned multiline text? Yes! :D</p>
</div>

CSS

.rectangle {
    postion:absolute;
    box-shadow: 10px #333;
    border-radius: 23px;
    border-top-right-radius: 0;
    border:6px solid;
    block:inline;
    width:200px;
    height: 120px;
    background-color: #444;
    float: left;
    margin: 5px;
    text-align: center;
    color:white;
   font-weight:900;
    text-decoration:none;
    display:table;
}
.txt {
    display: table-cell; 
    vertical-align: middle; 
    text-align: center;
}