问题：我不知道如何在使用reset.css时更改页脚的高度，页脚div的height属性不会更改任何内容。
您可以在本地克隆此文件，然后check it out here
HTML

<div class="wrapper">
    <p>Your website content here.</p>
</div>
<div id="footer">
    <p>&copy; 2013 Friend | Design and Development. All Rights Reserved.</p>
</div>

CSS - style.css

html, body {
    height: 100%;
    font-family: 'Arial', Helvetica;
}
.wrapper {
    min-height: 100%;
    height: auto !important;
    height: 100%;
    margin: 0 auto -4em;
}
#footer {
    background: #444444;
    height: 100px;
    font-family: 'Open Sans', sans-serif;
    color: #FFFFFF;
    padding: 20px;
}

RESET.css

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}