html - Simple CSS z-index example not working -

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i'm trying make simple html 2 images 1 above other on z-index:

<html>     <head>         <title>test</title>         <style type="text/css">             {                 position: absolute;                 left: 0px;                 top:0px;                 z-index:0;             }              front {                 position: absolute;                 left: 0px;                 top:0px;                 z-index:1;             }         </style>     </head>     <body>         <img id="front" src="loading.gif">         <img id="back" src="plasma.jpg">     </body> <html>

but why z-index not working?

you forgot add # before ids in css.

#back { ... } #front { ... }

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