JSFiddle - React, Tailwind, and code Playground

HTML

<span class="wpcf7-not-valid-tip">Please fill the required field.</span>

CSS

.wpcf7-not-valid-tip {
        background: red;
        color: white;
        padding: 10px;
        width: 100px;
        background-position: 50% 100%; 
        background-repeat: no-repeat;
        background-image: url('http://s24.postimg.org/qacevkf7l/green_error_arrow.png');
}