CSS - Ayuda con layout

* { margin:0; padding:0; }

html, body, #wrap { height: 100%; }

body > #wrap {height: auto; min-height: 100%;}

#main { padding-bottom: 150px; }  /* must be same height as the footer */

#footer {

        position: relative;

        margin-top: -150px; /* negative value of footer height */

        height: 150px;

        clear:both;}

/* CLEAR FIX*/

.clearfix:after {content: ".";

        display: block;

        height: 0;

        clear: both;

        visibility: hidden;}

.clearfix {display: inline-block;}

/* Hides from IE-mac \*/

* html .clearfix { height: 1%;}

.clearfix {display: block;}

/* End hide from IE-mac */

<div id="wrap">

        <div id="main" class="clearfix">

        </div>

</div>

<div id="footer">

</div>