JSFiddle - React, Tailwind, and code Playground

HTML

<button>Next question</button>
<button disabled>Next question</button>

CSS

button{
    background-color: #6CB300;
    color:#fff;
    border:0;
    font-size:1.5em;
    padding:2% 3%;
}
button[disabled]{
    background-color:#CCC;
}