How to vertically and horizontally center two images inside a div on a responsive page

Tags: html,css,responsive-design,skeleton-css-boilerplate,normalize-css

Problem :

I'm using Skeleton and Normalize css. I want to center two images side by side vertically and horizontally inside the div container. When the page becomes narrower, I want the 2nd image at the bottom of the first image as below

Normal width: img1 img2

Narrow view: img1 img2

Here is my code:

    <div id="center">
    <div class="left"><img class="u-max-full-width" src="img1.jpg"></div>        
    <div class="right"><img class="u-max-full-width" src="img2.jpg"></div>

And here is my css:

#center {
width: 100%;
text-align: center;
position: relative;
display: table;}
#center > div {
display: table-cell;
vertical-align: middle;}

.left {
width: 50%;
height: 100%;
text-align: center;}

.right {
width: 50%;
height: 100%;
text-align: center;}

With this code they are vertically centered in normal width but I cannot get the images aligned below each other in narrower view. Any ideas how to do this? Joe

Solution :

Try this:

.container {
  text-align: center;
  display: -webkit-box; /* OLD - iOS 6-, Safari 3.1-6 */
  display: -moz-box; /* OLD - Firefox 19- (buggy but mostly works) */
  display: -ms-flexbox; /* TWEENER - IE 10 */
  display: -webkit-flex;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;

  -webkit-box-align: center;
  -webkit-flex-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;

  height: 800px;
<div class='container'>

   <img src="//" class="thumbnail" alt="">
   <img src="//" class="thumbnail" alt="">


Edit: Sry didn't read properly.. These don't break up if the page gets narrow.

As François pointed out, add this to the css:

flex-wrap: wrap;

Another Edit: apparently IE has some problems with this. Make a wrapper around .container (container_wrapper) or something. Give it:

display: flex;
flex-direction: column;
height: 100%;

And make sure your html and body are set to 100% height

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