JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="movie"><div class="movie previewBulk"></div></a>
<a href="#" class="movie"><div class="movie previewBulk"></div></a>

CSS

.previewBulk {border:1px solid black; height:1em;}

JavaScript

var movie = document.getElementsByClassName("movie");

for(var i = 0; i<movie.length; i++){
 movie.item(i).style.width = "100px";
}