JSFiddle - React, Tailwind, and code Playground

HTML

<button>hello</button>

<button class="prim">hello2</button>

CSS

button {
    font-family: 'Ubuntu', sans-serif;
    font-size: 1em;
    font-weight: bold;
    color: white;
    border: 3px double white;
    background: #00663f;    
    outline:0;
    min-width: 250px;
}

button.prim {
    background: #00663f;    
}