JSFiddle - React, Tailwind, and code Playground

HTML

<p><button>This is a button</button></p>
<input type='submit' value='This is a button, but with different code'>

CSS

button,input{
    color:blue;
}

button:focus,input:focus{
    color:red;
}

button::after,input::after{
    content: " - Focus Me!";
}

button:focus::after,input:focus::after{
    content: " and you have focused it";
}