responsive design - How to pin an image onto another image css -

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i have code:

<body style="margin:0; padding:0;">     <div style="position: relative; left:0; top:0;">          <img src="images/fullscreen.png" style="max-width: 100%; width: 100%; height:auto; position: relative; top:0; left:0;"/>         <img src="images/smaller_animated.gif" style="position:absolute; top:140px; left:458px;"/>     </div> </body>

fullscreen.png large full screen image. made kind of responsive, if make browser width less doesn't scroll , instead resizes.

now have animated gif want place within area of fullscreen image. there large rectangle grey background within fullscreen image , want pin animated gif centre of space. works fine except when resize window, gif doesnt move/resize fullscreen image , moves outside rectangle background.

ive played around making absolute , relative dont seem getting close, ideas?

you can this:

html:

<div id="fullscreen" align="center">  <img class="center_image" src="images/smaller_animated.gif"/> </div>

css: 

#fullscreen {     background: url(images/fullscreen.png) red;     background-size: 100% 100%;     max-width: 100%;      width: 100%;      height: 100%;     position: absolute;         top: 0;     left: 0; } .center_image {     position: absolute;     top: calc(50% - /* halve height of image */);     height: /* height of image */;     width: /* width of image */; }

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