JSFiddle - React, Tailwind, and code Playground

HTML

<span class="one">0</span><span class="one">0</span><span class="one">0</span><span class="one">0</span>
<span class="two">1</span><span class="two">1</span>

CSS

.one {
    border: 2px solid #333;
    border-radius: 3px;
    margin: 1px;
}

.two {
    border: 2px solid #333;
    border-radius: 3px;
    margin: 1px;
    background: #333;
    color: #fff;
}