<head>
<style>
#a{
width:400px;
height:200px;
border:1px solid red;
position:relative;
}
#b{
width:100px;
height:50px;
border:1px solid green;
position:absolute;
bottom:0;
right:0;
}
#c{
width:100px;
height:50px;
background:green;
position:relative;
top:280px;
left:210px;
z-index:1;
}
#z{
width:400px;
height:200px;
border:1px solid red;
margin-top:5px;
}
#x{
width:100px;
height:50px;
background:red;
position:absolute;
top:280px;
left:140px;
}
#y{
width:100px;
height:50px;
border:1px solid green;
position:relative;
top:110px;
left:430px;
}
style>
head>
<body>
<div id="a">
a
<div id="b">bdiv>
<div id="c">cdiv>
div>
<div id="z">
z
<div id="x">xdiv>
<div id="y">ydiv>
div>
body>
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