HTML+CSS 实现一个简单的登录页面（背景图片完全适应不失帧）

HTML：<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title><link rel="stylesheet" type="text/css" href="css/tx1.css" /&...

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生于忧患，死于安乐2017

28708人浏览 · 2019-10-16 18:11:19

生于忧患，死于安乐2017 · 2019-10-16 18:11:19 发布

HTML：

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		 <link rel="stylesheet" type="text/css" href="css/tx1.css" />
		
	</head>
	<body>

			<div class="login-box">
			<h2>Login</h2>
			<form>
				<div class="login-field">
					<input type="text" name="" required="" />
					<label>Username</label>
				</div>
				<div class="login-field">
					<input type="password" name="" required="" />
					<label >Password</label>
				</div>
				<button type="submit">Submit</button>
			</form>
		</div>

		
		 
	</body>
</html>

css：

body{
	margin: 0;
	padding: 0;
	font-family: sans-serif;
	background: url(../img/bg.jpg)  no-repeat center 0px;
	background-size: cover;

	

     background-position: center 0; 
     background-repeat: no-repeat;  
     background-attachment: fixed; 
      -webkit-background-size: cover;  
      -o-background-size: cover;  
      -moz-background-size: cover;  
      -ms-background-size: cover;
	
}
.login-box{
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%,-50%);
	width: 400px;
	padding:40px;
	background: rgba(0,0,0,.8);
	box-sizing: border-box;
	box-shadow: 0 15px  25px rgba(0,0,0,.5);
	border-radius: 10px;
}
.login-box h2{
	margin: 0 0 30px;
	padding: 0;
	text-align: center;
	color: #fff;
}
.login-box .login-field{
	position: relative;
}
.login-box .login-field  input{
	width: 100%;
	padding: 10px 0;
	font-size: 16px;
	color: #fff;
	margin-bottom: 30px;
	border: none;
	border-bottom: 1px solid #fff;
	outline: none;
	background: transparent;
}
.login-box .login-field  label{
	position: absolute;
	top: 0;
	left: 0;
	letter-spacing: 1px;
	padding: 10px 0;
	font-size: 16px;
	color: #fff;
	pointer-events: none;
	transition: .5s;
}
.login-box .login-field input:focus ~ label,
.login-box .login-field input:valid ~ label{
	top: -23px;
	left: 0;
	color: aqua;
	font-size: 12px;
}
.login-box button{
	background: transparent;
	border: none;
	outline: none;
	color: #fff;
	background: #03a9f4;
	padding: 10px 20px;
	cursor: pointer;
	border-radius: 5px;
}