JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <span class="input-copy">dd/mm/yyyy</span>
    <input type="text" value="dd/mm/yyyy" />
</div>

CSS

input { outline: none; border-radius: 4px; height:16px; border: 2px solid black; padding: 4px; font-weight:bold; line-height:16px; }
div { position:relative; }

JavaScript

$(function () {
    var $m = $(".input-copy"), m = $m[0],
        $i = $m.next("input"), i = $i[0],
        cs = window.getComputedStyle(i, null),
        rts = "runtimeStyle" in document.body ? "runtimeStyle" : "style";
    
    for (var k in cs) {
        try
        {
            m[rts][k] = cs[k], m[rts][k];
        }catch(e)
        {
            console.dir(e);
        }
    }
});