我想给我的固定标题一个彩色背景。我尝试了几种不同的方法，我认为可能有一个简单的答案，但我似乎无法找出它是什么：
我该怎么做呢？
HTML：
<body>
<div class="gridContainer clearfix">
<div id="LayoutDiv1"><h1>Hello</h1></div>
<div id="LayoutDiv2"></div>
<div id="LayoutDiv3"></div>
<div id="LayoutDiv4"></div>
<div id="LayoutDiv9">Goodbye</div>
<div id="LayoutDiv10"></div>
</div>
</body>
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 */
#LayoutDiv1 {
position: fixed;
height: 50px;
top: 0;
width: 100%;
z-index: 10000;
background:#FFF;
}
#LayoutDiv2 {
position: fixed;
height: 50px;
top: 50px;
width: 100%;
z-index: 10002;
background:#FFF;
}
#LayoutDiv3 {
margin-top: 135px;
}
#LayoutDiv9 {
position: fixed;
height: 60px;
width: 100%;
z-index:10006;
background:#FFF;
max-height: 100px;
bottom: 60px;
}
#LayoutDiv10 {
position: fixed;
height: 60px;
width: 100%;
z-index:10008;
background:#FFF;
bottom:0px;
max-height: 60px;
}