JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <h2>Property CSS Display Flex</h2>
    <div class="main-container">
        <div class="content"></div>
        <div class="content"></div>
        <div class="content"></div>
    </div>
</div>

CSS

* {margin: 0; padding: 0;}
body {font-family: sans-serif;}

.container {
    width: 700px; 
    margin: auto;
}

.container h2 {
    padding: 30px 0;
}

.main-container {
    display: flex;
    /* Prefix CSS3 */
    display: -moz-flex;
    display: -o-flex;
    display: -webkit-flex;
    background-color: red;
    padding: 30px;
    justify-content: space-around;
}

.content {
    background-color: aqua;
    width: 150px;
    height: 150px;
    margin: 10px;
}