JSFiddle - React, Tailwind, and code Playground

HTML

<div class="menu">
                ...
</div>
<div class="menu">
               ....
</div><div class="menu">
                ...
</div>
<div class="menu">
               ....
</div><div class="menu">
                ...
</div>
<div class="menu">
               ....
</div>

CSS

.menu { border: solid 2px red;}

JavaScript

function InitMenus()
{
	var tabMenus = document.getElementsByClassName("menu");
	for (i = 0; i < tabMenus.length; i++)
		tabMenus[i].style.height = "40px";
}
InitMenus();