JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://www.google.com/recaptcha/api.js"></script>
<div class="recaptcha-wrap"> 
<div class="g-recaptcha" data-sitekey="6Le_WAITAAAAAGx43F3zDgqGaI3AadcGAbfEmHnP" data-theme="dark"></div>
</div>

CSS

.recaptcha-wrap {
    position: relative;
    height: 76px;
    padding:1px 0 0 1px;
    background:#222;
    > div {
        position: absolute;
        bottom: 2px;
        right:2px;
        font-size:10px;
        color:#ccc;
    }
}

.recaptcha-wrap:after {
    content:'';
    display: block;
    background-color: #222;
    height: 2px;
    width: 100%;
    top: -1px;
    left: 0px;
    position: absolute;
}


.recaptcha-wrap:before {
    content:'';
    display: block;
    background-color: #222;
    height: 100%;
    width: 2px;
    top: 0;
    left: -1px;
    position: absolute;
    z-index: 1;
}


#g-recaptcha {
    overflow: hidden;
    height: 76px;
    border-right: 60px solid #222222;
    border-top: 1px solid #222222;
    border-bottom: 1px solid #222;
    position: relative;
    box-sizing: border-box;
    max-width: 294px;
}