JSFiddle - React, Tailwind, and code Playground

HTML

<div id="panel"> 
    <span class="box-1">Label #1</span>
    <div class="center-box"> 
        <span class="box-2">Label #2</span>
        <span class="box-3">Label #3</span>
    </div> 
    <span class="box-4">Label #4</span>
</div>

CSS

html, body {
    font-family:'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    font-weight: 500;
}
#panel {
    width: 100%;
    background: #ddd;
    display: block;
    height: auto;
    float: left;
}
.box-1, .box-2, .box-3, .box-4 {
    border: 2px solid #aaa;
    background: #fff;
    padding: 1em;
    width: auto;
    float: left;
    border-radius: 2px;
    display: inline-block;
}
.center-box {
    margin: 0 auto;
    float :left;
    border: 1px solid blue;
    text-align: center;
}
.box-4 {
    float: right;
}
@media screen and (max-width: 568px) { 
    .box-1, .box-4 {
        width: 50%;
        float: left;
    }
    .center-box {
        margin: 0 auto;
    }
}