CSS

下記は中央寄せの場合

html, body{
    margin: 0;
    padding: 0;
    height: 100%;
    border: solid #0ff  3px;
    text-align: center; //IE用
}

#container-page{
    margin: 0 auto;
    width: 600px;
    background: #ccc;
    text-align: left; //IE用
    position: relative;
    min-height: 100%;
    height: auto !important;
    height: 100%;
    border: solid #00f  3px;
}

#container-content{
    padding-bottom: 40px;
    border: solid #0f0  3px;
}

#container-foot{
    width: 100%;
    background: #cc0;
    position: absolute;
    bottom: 0 !important;
    bottom: -1px;
    border: solid 3px #f00;
}

#container-foot-in{
    background-color: #f00;
}