JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
    <div id="sibling">1</div>
    <div id="resizableDiv">2</div>
</div>

<br/><button>Show/Hide</button>

CSS

#parent {
    display: table;
    width: 100%;
    height: 100px;
}
#sibling, #resizableDiv {
    display: table-row;
    background: silver;
}
#resizableDiv {
    background: gray;
}

JavaScript

$("button").click(function () {
    $("#resizableDiv").toggle();
});