JSFiddle - React, Tailwind, and code Playground

HTML

<input class="add_comment" name="add_comment" type="submit" value="Comment" />

CSS

body {
    padding: 20px;
}

.add_comment {
    width: 80px;
    height: 28px;
    color: #fff;
    font-size: 13px;
    line-height: 28;
    background: #0073a3;
    border: none;
}

.add_comment::-moz-focus-inner {
    border: 0;
}