html - CSS for an image sitting inside a div within a lightbox (Many layers) -

i having issues getting head around dimensions of image sitting within div inside lightbox. break down:

1 light box 2 columns in lightbox named lhc , rhc image sits in lhc no matter if use % or px distorts thumb.

the image needs not distort regardless of original size needs scale down , sit dead centre of lhc div.

see code , going wrong:

.imagebox_container {     height: 600px;     width: 800px; } .fancybox-prev {     width: 20%; } .fancybox-next {     width: 20%;     right: 400px; } .lhc {     width: 500px;     height: 100%;     position: relative;     float: left;     display: block;     background-color: #000; } .rhc {     width: 300px;     background-color: #fff;     height: auto;     position: relative;     overflow-y: scroll; } .fancyimg{         height: 50%; width: 50%; display:block;     margin:auto; margin-top: 25%;} 

here html/php:

    <div class="imagebox_container">   <div class="lhc"><img class="fancyimg" src="uploads/folio/<?php echo $imgdata['filename']; ?>" /></div>   <div class="rhc">     <div id="imagedetails">       <div id="imagedetails_useravatar"></div>       <div id="imagedetails_username"></div>     </div>     <hr />     <div id="likeboard"></div>     <div id="commentboard">       <?php /* load comments */ ?>       <?php while($row = mysqli_fetch_assoc($result_comments)){ ?>       <div class="commentbox"><span class=""><span class="comment"><?php echo $row['comment']; ?></span></span></div>       <hr /> 

hi playing around max-heights/widths little closer...

.fancyimg{         max-height: 50%; max-width: 50%; display:block;     margin:auto; margin-top: 25%;}