JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <button >Button 1</button>
    <input type="submit" value="Login Button" />
</form>

CSS

button {
    background-color: lightblue;
}
button:before{
    content: 'a';
}

input {
    background-color: lightblue;
}
inout:before {
    content: 'a';
}