JSFiddle - React, Tailwind, and code Playground

HTML

<input class="btn" type="submit" id="query" name="query" value="Q" title="Query">

CSS

.btn
{
    cursor:pointer;
    border: none;
    background: none;
    width: 20px;
    height: 20px;
}
.btn input[type="submit"]:hoover
{
    border: 1px solid black;
}