JSFiddle - React, Tailwind, and code Playground

HTML

<div class="slider_wrapper">
  <img src="http://farm9.staticflickr.com/8499/8350108032_d3f527decc.jpg" class="active" />
</div>

CSS

.slider_wrapper { background:#000; height:700px }

JavaScript

$(document).ready(function(){
  var current_img = $('.slider_wrapper img.active');
  var wrapper_w = current_img.width();
  var wrapper_h = current_img.height();
  
  $('.slider_wrapper').css({ 'width': wrapper_w+'px', 'height': wrapper_h+'px' });
  
});