Вам нужно объединить свои теги.
body {
background-image:
url(../images/red.png) left top no-repeat,
url(../images/blue.png) center top no-repeat,,
url(../images/yellow.png) right top no-repeat,
}
Редактировать:
<style type="text/css">
background-image:
url(../images/red.png),
url(../images/yellow.png);
background-position: left top, left bottom;
background-repeat: no-repeat;
#centerIMG {
margin-top:-50px;
height: 100px;
width: 100px;
background:url(../images/blue.png) center left no-repeat;
}
#outer {height: 100%; overflow: hidden; position: relative;}
#outer[id] {display: table; position: static;}
#middle {position: absolute; top: 50%;} /* for explorer only*/
#middle[id] {display: table-cell; vertical-align: middle; width: 100%;}
#inner {position: relative; top: -50%} /* for explorer only */
</style>
<div id="outer">
<div id="middle">
<div id="inner">
<div id="centerIMG"></div>
</div>
</div>
</div>
Редактировать:
<style type="text/css">
body
{
background:
url("red.png") top repeat-x,
url("blue.png") bottom repeat-x,
url("orange.png") center repeat;
background-size: 200px, 100px;
}
</style>