JSFiddle - React, Tailwind, and code Playground

HTML

<div class="textbox">
        <input type="text" name="username" required="required" placeholder="Benutzername">
</div>

CSS

.textbox input{
    border: none;
    outline: none;
    background: none;
    color: white;
    font-size: 18px;
    width: 80%;
    float: left;
    margin: 0 10px;
}
body {
  background:#1a1a1a;
}