CSSを使用してフッターをブラウザの下部に貼り付けるにはどうすればよいですか?

<code class="HTML"><form>
...
<div class="Main" />
<div id="Footer" />
</form></code>

<code class="CSS">* {
    margin: 0;
}

html, body {
    height: 100%;
}

#Footer {
    background-color: #004669;
    font-family: Tahoma, Arial;
    font-size: 0.7em;
    color: White;
    position: absolute;
    width: 100%;
    bottom: 0px;
    height: 4em;
}

.Main {
    position: relative;
    min-height: 100%;
    height: auto !important;
    height: 100%;

    margin: 0 25% -4em 25%;

    font-family: Verdana, Arial, Tahoma, Times New Roman;
    font-size: 0.8em;
    word-spacing: 1px;
    line-height: 170%;
}</code>