我有一个带有固定页眉和页脚的简单网页。页眉为蓝色背景，正文为白色背景，页脚为黑色背景。
当我将浏览器调整为更小的尺寸时，标题的蓝色背景不会改变高度，但内容会溢出到正文中（我使用的是 Dreamweaver 的流体网格布局）。这导致标题的内容看起来像是溢出了标题，因为背景的高度确实变大了，这是我需要的。
CSS：
@charset "utf-8";
/* Simple fluid media
Note: Fluid media requires that you remove the media's height and width attributes from the HTML
http://www.alistapart.com/articles/fluid-images/
*/
img, object, embed, video {
max-width: 100%;
}
/* IE 6 does not support max-width so default to width 100% */
.ie6 img {
width:100%;
}
/*
Dreamweaver Fluid Grid Properties
----------------------------------
dw-num-cols-mobile: 5;
dw-num-cols-tablet: 8;
dw-num-cols-desktop: 10;
dw-gutter-percentage: 25;
Inspiration from "Responsive Web Design" by Ethan Marcotte
http://www.alistapart.com/articles/responsive-web-design
and Golden Grid System by Joni Korpi
http://goldengridsystem.com/
*/
/* Mobile Layout: 480px and below. */
.gridContainer {
margin-left: auto;
margin-right: auto;
width: 87.36%;
padding-left: 1.82%;
padding-right: 1.82%;
}
#LayoutDiv1 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv2 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv3 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv4 {
clear: none;
float: left;
margin-left: 4.1666%;
width: 100%;
display: block;
}
#LayoutDiv5 {
clear: none;
float: left;
margin-left: 4.1666%;
width: 100%;
display: block;
}
#LayoutDiv6 {
clear: none;
float: left;
margin-left: 4.1666%;
width: 100%;
display: block;
}
#LayoutDiv7 {
clear: none;
float: left;
margin-left: 4.1666%;
width: 100%;
display: block;
}
#LayoutDiv8 {
clear: none;
float: left;
margin-left: 4.1666%;
width: 100%;
display: block;
}
#LayoutDiv9 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv10 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
/* Tablet Layout: 481px to 768px. Inherits styles from: Mobile Layout. */
@media only screen and (min-width: 481px) {
.gridContainer {
width: 90.675%;
padding-left: 1.1625%;
padding-right: 1.1625%;
}
#LayoutDiv1 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv2 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv3 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv4 {
clear: none;
float: left;
margin-left: 2.5641%;
width: 100%;
display: block;
}
#LayoutDiv5 {
clear: none;
float: left;
margin-left: 2.5641%;
width: 100%;
display: block;
}
#LayoutDiv6 {
clear: none;
float: left;
margin-left: 2.5641%;
width: 100%;
display: block;
}
#LayoutDiv7 {
clear: none;
float: left;
margin-left: 2.5641%;
width: 100%;
display: block;
}
#LayoutDiv8 {
clear: none;
float: left;
margin-left: 2.5641%;
width: 100%;
display: block;
}
#LayoutDiv9 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv10 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
}
/* Desktop Layout: 769px to a max of 1232px. Inherits styles from: Mobile Layout and Tablet Layout. */
@media only screen and (min-width: 769px) {
.gridContainer {
width: 88.2%;
max-width: 1232px;
padding-left: 0.9%;
padding-right: 0.9%;
margin: auto;
}
#LayoutDiv1 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv2 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv3 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv4 {
clear: both;
float: left;
margin-left: 0;
width: 18.3673%;
display: block;
}
#LayoutDiv5 {
clear: none;
float: left;
margin-left: 2.0408%;
width: 18.3673%;
display: block;
}
#LayoutDiv6 {
clear: none;
float: left;
margin-left: 2.0408%;
width: 18.3673%;
display: block;
}
#LayoutDiv7 {
clear: none;
float: left;
margin-left: 2.0408%;
width: 18.3673%;
display: block;
}
#LayoutDiv8 {
clear: none;
float: left;
margin-left: 2.0408%;
width: 18.3673%;
display: block;
}
#LayoutDiv9 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
#LayoutDiv10 {
clear: both;
float: left;
margin-left: 0;
width: 100%;
display: block;
}
}
@charset "utf-8";
/* CSS Document */
.gridContainer {
margin-left: 0px;
width: 100%;
padding-left: 0px;
}
body {
margin: 0px;
}
#LayoutDiv1 {
position: fixed;
height: 70px;
top: 0px;
width: 100%;
z-index: 10000;
background: #FFF;
font-size: 70px;
color:#FFF;
background-color: #069;
}
#LayoutDiv2 {
position: fixed;
height: 30px;
top: 70px;
width: 100%;
z-index: 10002;
color: #FFF;
background-color: #069;
}
#LayoutDiv3 {
margin-top: 135px;
}
#LayoutDiv9 {
position: fixed;
height: 40px;
width: 100%;
z-index:10006;
background:#FFF;
max-height: 100px;
bottom: 15px;
color: #FFF;
background-color: #000;
}
#LayoutDiv10 {
position: fixed;
height: 15px;
width: 100%;
z-index:10008;
background:#FFF;
bottom:0px;
max-height: 60px;
color: #FFF;
background-color: #000;
}
HTML：
<body>
<div class="gridContainer clearfix">
<div id="LayoutDiv1">Hello Welcome this is an example of the kind of content that I will input when using my real html. For now I am just trying to get something large enough that is going to effectively spill over into the content. </div>
<div id="LayoutDiv2"></div>
<div id="LayoutDiv3"></div>
<div id="LayoutDiv4"></div>
<div id="LayoutDiv9">Goodbye</div>
<div id="LayoutDiv10"></div>
</div>
</body>