为什么背景图片不能填满整个div
我有下面的代码显示一个SPAN内部的DIV ，然后另一个DIV显示一些文本。 我遇到的问题是当我调整浏览器的文本和背景图像时，所有的位置都不合适。
以下是图像未填满DIV的截图：
另外，当我调整大小时，文本都是不合适的：
这是HTML：
<div id="subpageHeaderImageSection">
<div id="subpageHeaderLeft">
<!--<img src="theImages/wcu.png" style="z-index: 5; position: absolute; bottom: 0; left: 10%; width: 194px; width: 185px;" />
<span id="quoteText" style="z-index: 4;">
We Have the Finest Physicians, Staff, and Systems for the Finest Healthcare
</span>-->
</div>
</div>
<div id="subpageFooter">
<div id="subpageFooterLeft">
<div style="z-index: 15; position: absolute; left: 0; padding-left: 20px; padding-top: 10px; font-weight: bold; color: #0000CC;">
State-Of-The-Art-Technology
</div>
<div style="z-index: 14; position: absolute; left: 0; padding-left: 40px; padding-top: 35px; padding-right: 8px; font-weight: normal; color: #000000;">
Our state-of-the-art technology ensures that we provide the finest healthcare. Our practice continuously invests in systems and equipment so that physicians can diagnose problems in the most accurate and efficient manner possible.
</div>
<div style="position: absolute; width: 90%; padding-top: 90px; padding-left: 5%; padding-right: 5%;"><hr /></div>
<div style="z-index: 13; position: absolute; left: 0; padding-left: 20px; padding-top: 110px; font-weight: bold; color: #0000CC;">
Advanced Electronic Medical Records
</div>
<div style="z-index: 12; position: absolute; left: 0; padding-left: 40px; padding-top: 135px; padding-right: 8px; font-weight: normal; color: #000000;">
Our advanced electronic medical record improves patient care and gives physicians all of the important patient information they need in one place.
</div>
<div style="position: absolute; width: 90%; padding-top: 175px; padding-left: 5%; padding-right: 5%;"><hr /></div>
<div style="z-index: 11; position: absolute; left: 0; padding-left: 20px; padding-top: 200px; font-weight: bold; color: #0000CC;">
Premier Radiology Services
</div>
<div style="z-index: 10; position: absolute; left: 0; padding-left: 40px; padding-top: 225px; padding-right: 8px; font-weight: normal; color: #000000;">
Filmless radiology capabilities provide rapid results and allow physicians to view images on an office computer screen within minutes. Our premier radiology services include MRI, CT scan, ultrasonography, nuclear medicine, bone densitometry and mammography. We offer computer-aided diagnosis (CAD), which is a tool to assist the radiologist in more accurately diagnosing breast disease.
</div>
<div style="position: absolute; width: 90%; padding-top: 310px; padding-left: 5%; padding-right: 5%;"><hr /></div>
<div style="z-index: 9; position: absolute; left: 0; padding-left: 20px; padding-top: 335px; font-weight: bold; color: #0000CC;">
Our Employees Make MyMed a Special Place
</div>
<div style="z-index: 8; position: absolute; left: 0; padding-left: 40px; padding-top: 360px; padding-right: 8px; font-weight: normal; color: #000000;">
MyMed values each of our employees’ experience, diversity and dedication. Ideas and backgrounds that our employees bring to our company enable us to be more effective in anticipating and exceeding our patients’ needs and expectations. <a class="blueLinks" href="http://www.mymed.com/talented_people.aspx">Click here</a> for the opportunity to meet some of the employees who greatly contribute to our success.
</div>
<div style="position: absolute; width: 90%; padding-top: 430px; padding-left: 5%; padding-right: 5%;"><hr /></div>
<div style="z-index: 7; position: absolute; left: 0; padding-left: 20px; padding-top: 455px; font-weight: bold; color: #0000CC;">
Wide Range Of Insurances
</div>
<div style="z-index: 6; position: absolute; left: 0; padding-left: 40px; padding-top: 480px; padding-right: 8px; font-weight: normal; color: #000000;">
A big advantage to using WESTMED Medical Group is the <a class="blueLinks" href="http://www.mymed.com/participating_insurance.aspx?id=473">wide range of insurance coverage</a> accepted. This means you should be able to keep your doctors even if you find you have to change insurance plans. We care equally about every patient regardless of the insurance provider.
</div>
</div>
<div id="subpageFooterRight">
</div>
</div>
这里是CSS：
#subpageHeaderImageSection {
position: relative;
top: 0;
width: 100%;
height: 450px;
}
#subpageHeaderLeft {
position: absolute;
left: 0;
float: left;
width: 100%;
height: 100%;
background: url('../theImages/subpageHeaderImage.png') no-repeat;
background-size: 100%;
}
#subpageFooter {
position: relative;
width: 100%;
height: 555px;
background: url('../theImages/bg_80_w.png');
box-shadow: 0 0 10px #FFFFFF;
}
#subpageFooterRight {
position: absolute;
right: 0;
width: 40%;
height: 100%;
float: right;
background-color: #000000;
}
#subpageFooterLeft {
position: absolute;
left: 0;
float: left;
width: 60%;
height: 100%;
}
#quoteText {
position: absolute;
bottom: 30%;
left: 40%;
overflow: hidden;
font-family: 'daysregular';
font-size: 30pt;
}
我真的很想帮助两件事：
使用background-size: 100% 100%完全填充（也许拉伸）其他明智的使用background-size: cover作为@Andras说
使用background-size:cover ，它会填充。