<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
/* 整个浏览器页面 */
html,
body {
background-color: #00005d;
height: 100%;
margin: 0;
}
.page {
/* 定宽 */
width: 1100px;
margin-top: 0;
margin-bottom: 0;
margin-right: auto;
margin-left: auto;
/* margin:0,auto; 不支持margin的多个属性值,F12显示属性值无效*/
height: 100%;
}
header {
background-color: #869dc7;
height: 150px;
/* 原图像素254*150 */
background-image: url(images/lighthouselogo.jpg);
background-repeat: no-repeat;
}
h1 {
color: #00005d;
font-size: 55px;
font-family: Verdana, Geneva, Tahoma, sans-serif;
font-weight: bold;
text-align: center;
line-height: 150px;
margin: 0;
}
aside {
background-color: #b3c7e6;
width: 180px;
margin: 0;
/* height: 620px; */
height: calc(100% - 150px - 50px);
float: left;
}
main {
background-color: white;
width: 920px;
/* height: 620px; */
height: calc(100% - 150px - 50px);
float: right;
}
h2 {
color: #90a5cb;
padding-top: 10px;
padding-left: 20px;
font-weight: bold;
font-size: 25px;
}
main p {
padding-left: 20px;
font-family: Verdana, Geneva, Tahoma, sans-serif;
font-size: 18px;
}
footer {
background-color: #869dc7;
height: 50px;
/* 如果不加clear属性,会受到中间元素float影响移动到上边 */
clear: both;
/* 水平居中 */
text-align: center;
/* 无法利用margin:0,auto;属性 借助line-height=height */
line-height: 50px;
font-family: Arial, Helvetica, sans-serif;
font-size: 14px;
color: #00005d;
}
</style>
</head>
<body>
<section class="page">
<header>
<h1>Lighthouse Island Bistro</h1>
</header>
<!-- <div class="middle"> -->
<aside>
<ul
style="list-style: none;font-family: Arial, Helvetica, sans-serif;font-weight: bold;color: white;font-size: 20px;">
<li style="color: #eae9ea;">Home</li>
<li>Menu</li>
<li>Directions</li>
<li>Contact</li>
</ul>
</aside>
<main>
<div style="float: right;clear: both;">
<img src="images/lighthouseisland.jpg" style="padding: 20px;padding-top:40px;height: 400px;">
</div>
<h2 style="padding-top: 20px;">Locally Roasted Free-Trade Coffee</h2>
<p>Indulge in the aroma of freshly ground roast coffee. Specialty drinks are available hot or cold.
</p>
<h2>Specialty Pastries</h2>
<p>Enjoy a selection of our fresh-baked, organic pastries, including fresh-fruit muffins, scones,
croissants, and cinammon rolls.
</p>
<h2>Lunchtime is Anytime</h2>
<p>Savor delicious wraps and sandwiches on hearty, whole-grain breads with locally-grown salad, fruit,
and vegetables.
</p>
<h2>Panoramic View</h2>
<p>Take in some scenery! The top of our lighthouse offers a panoramic view of the countryside.
Challenge your friends to climb our 100-stair tower.
</p>
</main>
<!-- </div> -->
<footer>Copyright © 2021
</footer>
</section>
</body>
</html>
定宽浮动布局,设计页面在整个浏览器页面水平居中位置,浏览器页面缩小时,仍水平居中,出现水平滚动条,显示不到的页面内容可以通过滚动条调节。
已知header高度、footer高度,使得aside的高度处于页面中间,并且不出现垂直滚动条?
cal(相对高度百分比 - 同级别元素高度1 - 同级别元素高度2);
相对高度100%--是相对父元素的高度,要求向上追溯父元素的时候有一个确切的数值(html的高度设置为100%时就是整个浏览器页面高度);另外还需要注意margin等高度,相对高度是相对父元素内容区的高度,所以要排除元素margin、padding等高度影响。
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