JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
</div>

CSS

#container {
    height: 100px;
    width: 10px;
    padding: 1px;
    background-color: #00f;
    
    display: table-cell;
    vertical-align: bottom;
}

.block {
    height: 10px;
    width: 10px;
    margin: 1px 0px 1px 0px;
    background-color: #0f0;
}