JSFiddle - React, Tailwind, and code Playground

HTML

<div class = "a">
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris id semper purus. Duis laoreet tellus in ante luctus semper. Praesent interdum urna quis luctus commodo.
    </div>
    <div class = "b">
        Curabitur vehicula eget leo a tristique. Donec eget aliquam erat. Mauris id porttitor lacus. 
    </div>

CSS

* {
        margin: 0;
        padding: 0;
    }
    
    body {
        padding: 10px;
    }
    
    .noSelection {
        -webkit-user-select: none;
        -moz-user-select: none;
        -o-user-select: none;
        -ms-user-select: none;
        user-select: none;
    }
    
    div + div {
        padding-top: 10px;
    }

JavaScript

$(function() {
        $("div").hover(function() {
            $(this).siblings("div").toggleClass("noSelection");    
        });
    });