1.實現效果
2.login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="login.css">
</head>
<body>
<div class="box">
<h2>Login</h2>
<form class="form-box">
<div class="inputBox">
<input type="text" name="" required="">
<label>Username</label>
</div>
<div class="inputBox">
<input type="password" name="" required="">
<label>Password</label>
</div>
<input type="submit" name="" value="提交">
</form>
</div>
</body>
</html>
3.login.css
body{
margin: 0;
padding: 0;
background: url("bg01.jpg");
font-family: sans-serif;
background-size: cover;
}
.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;
}
.box h2{
margin: 0 0 30px;
padding: 0;
color: #fff;
text-align: center;
}
.box .inputBox{
position: relative;
}
.box .inputBox input{
width: 100%;
padding: 10px 0;
font-size: 16px;
color: #fff;
margin-bottom: 30px;
border-bottom: 1px solid #fff;
outline: none;
background: transparent;
}
.box .inputBox label{
position: absolute;
top:0;
left: 0;
padding: 10px 0;
font-size: 16px;
color: #fff;
pointer-events: none;
transition: .5s;
}
.box .inputBox input:focus ~ label,
.box .inputBox input:valid ~label{
top:-18px;
left: 0;
color: #03a9f4;
font-size: 12px;
}
.box input[type='submit']{
background: transparent;
border: none;
outline: none;
color: #03a9f4;
padding: 10px 20px;
border-radius: 5px;
cursor: pointer;
top: 50%;
left: 50%;
}
