在b站看到了一個教程，自己動手也試了試
視頻鏈接：https://www.bilibili.com/video/BV1tA411h7id
成品
源代碼
login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
<body>
<div class="container">
<div class="login-wrapper">
<div class="header">Login</div>
<div class="form-warpper">
<input type="text" name="username" placeholder="username" class="input-item">
<input type="password" name="password" placeholder="password" class="input-item">
<div class="btn">Login</div>
</div>
<div class="msg">
Don't have account?<a href="#">Sign up</a>
</div>
</div>
</div>
</body>
</html>
style.css
*{
padding: 0;
margin: 0;
font-family: 'Open Sans Light';
letter-spacing: .05em;
}
html{
height: 100%;
}
body{
height: 100%;
}
.container{
height: 100%;
background-image: linear-gradient(to right,#fbc2eb,#a6c1ee);
}
.login-wrapper{
background-color: #fff;
width: 250px;
height: 500px;
border-radius: 15px;
padding: 0 50px;
position: relative;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
.login-wrapper .header{
font-size: 30px;
font-weight: bold;
text-align: center;
line-height: 200px;
}
.login-wrapper .form-warpper .input-item{
display: block;
width: 100%;
margin-bottom: 20px;
border: 0;
padding: 10px;
border-bottom: 1px solid rgb(128,125,125);
font-size: 15px;
outline: none;
}
.login-wrapper .form-warpper .input-item::placeholder{
text-transform: uppercase;
}
.login-wrapper .form-warpper .btn{
text-align: center;
padding: 10px;
width: 100%;
margin-top: 40px;
background-image: linear-gradient(to right,#a6c1ee,#fbc2eb);
color:#fff;
}
.login-wrapper .msg{
text-align: center;
line-height: 80px;
}
.login-wrapper .msg a{
text-decoration-line: none;
color: #a6c1ee;
}