html - CSS scale down image to fit in containing div, without specifing original size -


i want have website can upload images of different sizes displayed in jquery slider. can't seem fit (scaling down) image in containing div. here's how i'm intending it

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org    /tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>untitled document</title>  <link rel="stylesheet" type="text/css" href="imtest.css"/> </head>  <body>  <div id="wrapper">   <div id="im"><img src="images/scarpa2_1.jpg" /></div>  </div>   </body> </html>

and css

#wrapper {     width: 400px;     height: 400px;     border: 2px black solid;     margin: auto; }  #im {     max-width: 100%; }

i've tried set max-width of image 100% in css. doens't work.

you can use background image accomplish this;

from mdn - background size: contain:

this keyword specifies background image should scaled large possible while ensuring both dimensions less or equal corresponding dimensions of background positioning area.

demo

css:

#im {     position: absolute;     top: 0;     left: 0;     right: 0;     bottom: 0;     background-image: url("path/to/img");     background-repeat: no-repeat;     background-size: contain; }

html:

<div id="wrapper">     <div id="im">     </div> </div>

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