JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <!-- Button als input Element mit dem Attribut type="submit" -->
    <input type="submit" value="Absenden">
    <!-- Button als button Element mit dem Attribut type="submit" -->
    <button type="submit">Absenden</button>
</form>

CSS

/* input Element */
input[type="submit"] {
    border: 2px solid red;
}
/* button Element */
button {
    border: 2px solid green;
}
/* beide Elemente */
input[type="submit"], button {
    padding: 5px 15px;
    background: #ccc;
}