JSFiddle - React, Tailwind, and code Playground

by Jithin Raj P R

HTML

<div class="tank">
    <div class="water" style="height: 30%;"></div>
</div>

<div class="tank">
    <div class="water" style="height: 70%;"></div>
</div>

CSS

.tank {
    width: 150px;
    height: 300px;
    border: 2px solid black;
    background: white;
    position: relative;
    
    display: inline-block;
    margin: 10px;
}

.tank .water {
    position: absolute;
    background: blue;
    width: 100%;
    bottom: 0;
}