JSFiddle - React, Tailwind, and code Playground

HTML

<div id="purple">
    <div id="red">
        <div class="blue"></div>
        <div class="blue"></div>
        <div class="blue"></div>
        <div class="blue"></div>
        <div class="blue"></div>
        <div class="blue"></div>
        <div class="blue"></div>
    </div>
</div>

CSS

#purple
{
    width:100%;
    border: 4px solid purple;
}

#red
{
    margin:auto;
    border: 4px solid red;
}

.blue
{
    display:inline-block;
    width:200px;
    height:50px;
    border: 4px solid blue;
    background:lightblue;
}