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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>0426作业</title>
<!--<link rel="stylesheet" href="static/css/style8.css">-->
<style>
body {
margin: 0;
background-color: green;
/*background-size: cover;*/
}
.shade {
/* 遮罩绝对定位,并自动伸展到整个窗口 */
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
/* 将背景设置为纯黑,并通过透明度使背影内容透出来 */
background-color: black;
opacity: 0.7;
}
.login img {
height: 460px;
width: 380px;
}
.login {
position: absolute;
left: 50%;
top: 50%;
width: 200px;
height: 300px;
background-color: blanchedalmond;
margin-left: -100px;
margin-top: -150px;
border-radius: 10%;
color: red;
line-height: 300px;
text-align: center;
box-shadow: 2px 2px 1px #888;
}
.ads{
position: fixed;
right: 0;
bottom:0;
background-color: blanchedalmond;
border-radius: 30%;
}
button {
position: absolute;
top:0;
right: 0;
margin-right: 5px;
background: none;
border: none;
font-size: 2em;
color: red;
}
</style>
</head>
<body>
<div class="shade"></div>
<div class="login">请在这里登录</div>
<div class="ads">
<p>
总结：<br>
1.遮罩的使用，遮罩两个属性值注意 opacity 透明度； 设置一个背景色。<br>
2.浮动窗口居中需要拉回去。<br>
<button onclick="this.parentNode.style.display = 'none'">X</button>
</p>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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