auto margin #

#wrapper{
 width:720px;    --> 혹은 80%
 margin:0 auto;  --> ie에서 안됨
for ie
body{
 text-align: center;
}
#wrapper{
 width: 720px;
 margin: 0 auto;
 text-align: left;
}


positioning과 negative margin #

#wrapper{
 width: 720px;
 position: relative;
 left: 50%;
 margin-left: -360px;  --> 720px / 2
}
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