关于元素叠加问题，望大佬们帮帮萌新

最近在学Bootstrap4

想实现navbar效果，于是去网上找了一些资料，但并没有符合我要求的答案

我遇到了一些问题，希望大佬们能多帮忙~

问题如下:

这是我想实现的效果
图片说明

但实际上我实现的效果
图片说明

我想菜单叠在下面的元素上。我尝试给navbar和下面的轮播图都加了position和z-index，然而没用。想问问大佬该如何解决

<body>
<div class="container-sm">
<div class="row">
<div class="col-sm-12 sticky-top  navbar navbar-expand-sm navbar-dark bg-dark">
<a href="#" class="navbar-brand">Tuput</a>
<button class="navbar-toggler" tabindex="0" data-toggle="collapse" data-target="#target">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="target">
<ul class="navbar-nav">
<li class="navbar-item"><a href="#" class="nav-link">主页</a></li>
<li class="navbar-item"><a href="#" class="nav-link">查找</a></li>
<li class="navbar-item"><a href="#" class="nav-link">赞助</a></li>
</ul>
</div>
</div>
<div class="col-sm-12 carousel slide px-0" id="mub" data-ride="carousel" data-interval="3000">
<div class="carousel-inner">
<div class="carousel-item active"><img class="card-img-bottom" src="" alt=""></div>
<div class="carousel-item"><img class="card-img-bottom" src="" alt=""></div>
<div class="carousel-item"><img class="card-img-bottom" src="" alt=""></div>
</div>
<div>
<a class="carousel-control-prev" href="#mub" data-slide="prev">
<span class="carousel-control-prev-icon"></span>
<span class="sr-only"></span>
</a>
<a class="carousel-control-next" href="#mub" data-slide="next">
<span class="carousel-control-next-icon"></span>
<span class="sr-only"></span>
</a>
</div>
</div>
</div>
</div>
</body>

回答

布局，头部显示框独立，分别给定位，还有实在看不出来问题，头部和下拉菜单分别给不同的背景色，调好之后再归置回去

补充：把下拉菜单抽离出来

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 新 Bootstrap4 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
    <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
    <!-- bootstrap.bundle.min.js 用于弹窗、提示、下拉菜单，包含了 popper.min.js -->
    <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
    <!-- 最新的 Bootstrap4 核心 JavaScript 文件 -->
    <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
    <title>Document</title>
    <style>
        #target {
            background: #ccc;
            /* margin: 0 10px; */
            position: absolute;
            width: 95%;
            top: 57px;
            /* margin: 0 auto; */
            transform: translate(9%, 0px);
        }
    </style>
</head>
<body>
    <div class="container-sm">
        <div class="row">
            <div class="col-sm-12 sticky-top  navbar navbar-expand-sm navbar-dark bg-dark">
                <a href="#" class="navbar-brand">Tuput</a>
                <button class="navbar-toggler" tabindex="0" data-toggle="collapse" data-target="#target">
                    <span class="navbar-toggler-icon"></span>
                </button>
            </div>
            <div class="collapse navbar-collapse" id="target">
                <ul class="nav flex-column">
                    <li class="navbar-item"><a href="#" class="nav-link">主页</a></li>
                    <li class="navbar-item"><a href="#" class="nav-link">查找</a></li>
                    <li class="navbar-item"><a href="#" class="nav-link">赞助</a></li>
                </ul>
            </div>
            <div class="col-sm-12 carousel slide px-0" id="mub" data-ride="carousel" data-interval="3000">
                <div class="carousel-inner">
                    <div class="carousel-item active"><img class="card-img-bottom" src="" alt=""></div>
                    <div class="carousel-item"><img class="card-img-bottom" src="" alt=""></div>
                    <div class="carousel-item"><img class="card-img-bottom" src="" alt=""></div>
                </div>
                <div>
                    <a class="carousel-control-prev" href="#mub" data-slide="prev">
                        <span class="carousel-control-prev-icon"></span>
                        <span class="sr-only"></span>
                    </a>
                    <a class="carousel-control-next" href="#mub" data-slide="next">
                        <span class="carousel-control-next-icon"></span>
                        <span class="sr-only"></span>
                    </a>
                </div>
            </div>
        </div>
    </div>
    <script>
    </script>
</body>
</html>

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