JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="item">sm</div>
    <div class="item">medium</div>
    <div class="item">large item</div>
    <div class="item">medium</div>
    <div class="item">medium</div>
    <div class="item">large item</div>
    <div class="item">sm</div>
    <div class="item">sm</div>
    <div class="item">medium</div>
    <div class="item">large item</div>
    <div class="item">medium</div>
    <div class="item">medium</div>
    <div class="item">large item</div>
    <div class="item">sm</div>

    <div class="filler"></div>
    <div class="filler"></div>
    <div class="filler"></div>
    <div class="filler"></div>
    <div class="filler"></div>
    <div class="filler"></div>
    <div class="filler"></div>
    <div class="filler"></div>
</div>

CSS

.container {
    display: flex;
    flex-flow: row wrap;
    
    /*style*/
    padding: 0.5em;
    background-color: royalblue;
}
.item {
    flex: 1 0 80px;
    
    /*style*/
    margin: 0.5em;
    padding: 1em;
    text-align: center;
    background-color: lightblue;
}
.filler {
    flex: 1 0 80px;
    height: 0px;
    
    /*style*/
    margin: 0 0.5em; 
    padding: 0 1em;
}