JSFiddle - React, Tailwind, and code Playground

HTML

<div class="loginSubmit">Hallo</div>

CSS

.loginSubmit {
    width: 100px;
    height: 100px;
    background: #e0e0e0;
    border: 1px solid #dedede;
    color: #555555;
    font-weight: bold;
    text-shadow: white 0px 1px;

    /* firefox */
    background: -moz-linear-gradient(top, #eaeaea, #f0f0f0 100%);
    -moz-border-radius: 5px;

    /* webkit */
    background: -webkit-gradient(linear, 0 0, 0 100%, from(#eaeaea), to(#f0f0f0));
    -webkit-border-radius: 5px;
    position: relative;
}

.loginSubmit:before {
    width: 98px;
    height: 98px;
    content: '';
    position: absolute;
    border: 1px solid black;
}