我正在尝试修改粘性页脚（http://www.cssstickyfooter.com/）以显示边距...右侧和左侧宽度很容易：90％和边距：自动
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但如何在不弄乱浮动页脚的情况下将高度设置为90％（或显示某种顶部和底部边距）
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感谢
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,
textarea,p,blockquote,th,td {
margin:0;
padding:0;
}
#header {
height: 33px;
line-height: 33px;
text-align: center;
background-color: green;
}
html { height: 100%; }
body { height: 100%; width: 90%; margin: auto; }
#wrap { min-height: 100%; background-color:gray; }
#main {
overflow: auto;
padding-bottom: 33px; /* must be same height as the footer */
background-color: red;
height: 100%;
}
#footer {
position: relative;
margin-top: -33px; /* negative value of footer height */
height: 33px;
line-height: 33px;
text-align: center;
background-color:blue;
}