模态框登录bootstrap

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./bootstrap-5.1.3-dist/js/bootstrap.js"></script>
    <link rel="stylesheet" href="./bootstrap-5.1.3-dist/css/bootstrap.css">
</head>
<body>
    <button class="btn btn-primary float-end" data-bs-toggle="modal" data-bs-target="#a">登录</button>
    <div class="modal" id="a" data-bs-backdrop="static">
        <div class="modal-dialog modal-sm">
           <div class="modal-content bg-light">
                <div class="modal-header">
                    登录百度账号
                    <button class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body">

                    <div class="row mb-3">
                        
                        <div class="col-md-9  mx-auto">
                            <input type="text"  class="form-control"placeholder="手机/邮箱/用户名">
                        </div>
                    </div>

                    <div class="row mb-3">
                    
                        <div class="col-md-9 mx-auto">
                            <input type="password"  class="form-control"placeholder="密码">
                        </div>

                    </div>
  <div class="form-check">
    <input type="checkbox" class="form-check-input">
    <label for="form-check-input">
下次自动登录
</label>

<div class="modal-footer">
    
    <button class="btn btn-primary  w-100" data-bs-dismiss="modal">登录</button>
</div>
</div>
                </div>
               
            </div>
        </div>
    </div>
    
</body>
</html>

效果