JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div></div>
    <div></div>
    <div></div>
</div>
<div class="container">
    <div></div>
    <div class="two"></div>
</div>

CSS

div.container {
    display: flex;
    
    margin-bottom: 10px;
}

div.container > div {
    flex: 1;
    margin-left: 10px;
    padding-bottom: 50%;
    
    background-color: blue;
}

div.container > div:first-child {
    margin-left: 0;
}

div.container > div.two {
    flex: 2;
}