<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CSS3 颜色</title>
<style>
body {
margin: 0;
padding: 0;
font-family: '微软雅黑';
background-color: #F7F7F7;
}
.wrapper {
width: 1024px;
margin: 0 auto;
}
.wrapper > section {
min-height: 300px;
margin-bottom: 30px;
box-shadow: 1px 1px 4px #DDD;
background-color: #FFF;
}
.wrapper > header {
text-align: center;
line-height: 1;
padding: 20px;
margin-bottom: 10px;
font-size: 30px;
}
.wrapper section > header {
line-height: 1;
padding: 10px;
font-size: 22px;
color: #333;
background-color: #EEE;
}
.wrapper .wrap-box {
padding: 20px;
}
/* 颜色的表达方式 red、rgb() #FFF */
/* 透明度 opacity transparent */
.parent {
width: 200px;
height: 200px;
background: red;
}
.child {
width: 100px;
height: 100px;
background: transparent;
}
</style>
</head>
<body>
<div class="wrapper">
<header>CSS3-透明度</header>
<section>
<header>opacity</header>
<div class="wrap-box">
<p>子元素会继承父元素的透明度</p>
</div>
</section>
<section>
<header>transparent</header>
<div class="wrap-box">
<p>完全透明，类似玻璃一样</p>
<div class="parent">
<div class="child"></div>
</div>
</div>
</section>
</div>
</body>
</html>