界面效果：
代码：
<!DOCTYPE html>
<html><head><title>Login Page</title><style>body {background-color: #f2f2f2;font-family: Arial, sans-serif;}form {background-color: #fff;border-radius: 5px;box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);padding: 20px;width: 300px;margin: 0 auto;}h2 {text-align: center;}input[type="text"],input[type="password"] {width: 100%;padding: 12px 20px;margin: 8px 0;display: inline-block;border: 1px solid #ccc;border-radius: 4px;box-sizing: border-box;}button {background-color: #4CAF50;color: white;padding: 14px 20px;margin: 8px 0;border: none;border-radius: 4px;cursor: pointer;width: 100%;}button:hover {background-color: #45a049;}form {/* This centers the login form horizontally */margin: 0 auto;/* This centers the login form vertically *//* This centers the login form vertically and slightly towards the top */position: absolute;top: 50%;top: 40%;left: 50%;transform: translate(-50%, -50%);
}</style></head><body><form><h2>Login</h2><label for="username">Username</label><input type="text" id="username" name="username" placeholder="Enter your username"><label for="password">Password</label><input type="password" id="password" name="password" placeholder="Enter your password"><button type="submit">Login</button></form></body>
</html>
