JSFiddle - React, Tailwind, and code Playground

HTML

<div id="red"></div>
<div id="black"></div>

CSS

#red {
    width: 100px;
    height: 100px;
    background: red;
}

#black {
    width: 100px;
    height: 100px;
    background: black;
}

JavaScript

function mestamiMenyaem(action) {
    var red = document.getElementById('red'),
    	black = document.getElementById('black');
    
    if(action === 'add'){
    	red.style.cssFloat = 'right';
    	black.style.cssFloat = 'left';
    } else if(action === 'remove') {
    	red.style.cssFloat = 'none';
    	black.style.cssFloat = 'none';
    }
} 

// Так добавим
mestamiMenyaem('add');

// Так удалим
mestamiMenyaem('remove');