实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登陆页</title>
<style>
body{
margin: 0px;
background-image: url("images/dt.png");
background-size: cover;
}
.td{
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
background-color: #000000;
opacity: 0.7;
}
.login img{
width: 400px;
height: 450px;
}
.login{
position: absolute;
left: 50%;
top: 50%;
margin-left: -200px;
margin-top: -225px;
}
</style>
</head>
<body>
<div class="td"></div>
<div class="login"><img src="images/QQ截图20190427101300.png" alt="登陆二维码"></div>
</body>
</html>运行实例 »
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