html - How to align center div element -


i have layout design,

and want align div id:#middle center.

i put background color green on div.

also want remain current state of layout scroll bars, size, etc, ...

what best way implement this?

i attached snippet of code , jsfiddle below.

jsfiddles: https://jsfiddle.net/crisply/yr8he13g/8/

please refer , give me advices.

thank in advance.

<body> <form method="post" action="./" id="form1" class="aspform">      <div id="header">         <div id="top">             <div id="logo">                 logo             </div>             <div id="pageinfo">                 <div id="pagetitle">title</div>                 <div id="pagedesc">description</div>                 <div id="samplinginfo">informations</div>             </div>         </div>         <div id="menu">             menu         </div>     </div>       <div id="content">         <div id="middle">             contents        </div>     </div>       <div id="footer">         <div id="copyright">             copyright &copy; 2015 ezrobotics. rights reserved.         </div>          <div id="loginstate">             <table>                 <tr>                     <td valign="top">                         <div id="username">admin</div>                     </td>                     <td>                         logout btn                     </td>                 </tr>             </table>         </div>     </div>     </form> </body>

here css

html, body {     /*font-size: 12px;*/     font-family:'tahoma', 'segoe ui', verdana !important; } body {     height:100%; } div {     box-sizing: border-box; } /* -- header ----------------------------------------------- */  #header {     position:absolute;     left:0px;     right:0;     top:0;     height:90px;     /* top height + menu height*/ } #top {     height: 60px; } #logo {     padding: 15px;     height: 30px;     width: 200px; } /* title & sampling information */  #pageinfo {     position: absolute;     top: 0px;     left: 0px;     right: 0px;     height: 40px;     margin: 10px;     text-align: center;     vertical-align:central; } #pagetitle {     font-size: 23px;     font-weight: bold;     font-family: tahoma, 'segoe ui', verdana; } #pagedesc {     font-size: 14px;     color: #666; } #samplinginfo {     position: absolute;     bottom: 0px;     right: 0px;     text-align: right;     font-size: 13px; } #menu {     height: 30px;     background-color: #666666;     text-align: center; } /* -- ccontent ----------------------------------------------- */  #content {     top:90px;     /* header height */     bottom:24px;     /* footer height */ } /* content */  #left {     position:absolute;     top: inherit;     /* header height */     bottom: inherit;     left:0;     width:200px;     padding: 10px 10px 10px 10px; } #right {     overflow:auto;     overflow-y: scroll;     position:absolute;     top: inherit;     /* header height */     bottom: inherit;     left:200px;     right:0;     padding: 10px 10px 10px 0px; } #middle {     overflow-y: scroll;     position:absolute;     top: inherit;     bottom: inherit;     left:0;     right:0;     padding: 10px 10px 10px 10px;     max-width: 940px;     background-color: green; } /* -- footer ----------------------------------------------- */  #footer {     position:absolute;     left:0px;     right:0;     bottom:0;     height:24px;     line-height: 24px;      overflow:hidden;     background-color: #666666;     color: #eee;     font-size: 13px; } #copyright {     text-align: right;     position: absolute;     top: 0px;     left: 0px;     padding-left: 5px;     /*background-color: blue;*/ } #loginstate {     position: absolute;     top: 0px;     right: 0px;     /*background-color: green;*/ } #username {     border: 1px solid #c5c5c5;     height: 18px !important;     line-height: 18px;     font-size:13px;     padding-left: 15px;     padding-right: 15px;     margin-right: 5px; } /* table */  .tbl {     width:100%;     height:100%;     /*border:1px solid #000;*/     border-collapse:collapse; } .tbl th, td {     /* border:1px solid #000; */ } .tbl th {     background-color:#eee; }

css

#middle {   overflow-y: scroll;   position: absolute;   top: inherit;   bottom: inherit;   left: 0;   right: 0;   padding: 10px 10px 10px 10px;   max-width: 940px;   background-color: green;   margin: 0 auto; }

demo


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