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bootstrap,导航栏组的颜色怎么更改?

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

  <!--nav-->
        <div class="container-fluid  nav-container">
            <div class="row">
                <div class="col-sm-8 offset-sm-2">
                    <nav class="navbar navbar-expand-sm navbar-dark" style="padding:0">
                        <a class="navbar-brand" href="#">
                         <img style="width:20rem" src="home-logo-hs.png" />
                        </a>
                        <button class="navbar-toggler" type="button" data-toggle="collapse"
                            data-target="#collapsiblejnshu">
                            <span class="navbar-toggler-icon"></span>
                        </button>
                        <div class="collapse navbar-collapse" id="collapsiblejnshu">
                            <ul class="navbar-nav justify-content-end" style="width:100%">
                                <!--链接组(导航组)-->
                                <li class="nav-item">

                                    <a class="nav-link nav-a" href="task8-1.html">首页 </a>
                                    <div class="nav-li"></div>

                                    <!--链接-->
                                </li>
                                <li class="nav-item">
                                    <a class="nav-link nav-a" href="../task8.1.3/task8-3.html">职业</a>
                                    <div class="nav-li"></div>
                                    <!--链接-->
                                </li>
                                <li class="nav-item ">
                                    <a class="nav-link nav-a" href="../task8.1.3/task8-3.html">推荐</a>
                                    <div class="nav-li"></div>
                                    <!--链接-->
                                </li>
                                <li class="nav-item">
                                    <a class="nav-link nav-a" href="../task8.1.2/task8-2.html">关于</a>
                                    <div class="nav-li"></div>
                                    <!--链接-->
                                </li>
                            </ul>
                        </div>
                    </nav>
                </div>
            </div>
        </div>
/*nav样式*/
.nav-container {
    background-color: rgb(41, 176, 120);
    color: white;
}

.nav-a {
    font-size: 1.7rem;
    padding: 20px 0 20px 10px;

}

.nav-item:hover .nav-li {
    visibility: visible;
}

.nav-li {
    visibility: hidden;
    border-bottom: 1px solid white;

}

下拉菜单出不来

布局

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

main {
    background-color: #fafafa;
}

header {
    /* height: 50px;   神坑定高！下拉出不来   */
}

.head-top {
    display: flex;
    justify-content: space-between;
}

/*客服热线*/
.tel {
    margin-top: 0.5%;
    margin-left: 2%;
    margin-top: 3px;
    font-size: 12px;
    color: #29B078;
}

/*微信微博qq图标*/
.head-img {
    margin-right: 2%;
}


.head-img img {
    width: 20px;
    margin-left: 8px;
}


/*加跳转链接*/
.head-text a {
    text-decoration: none;
    color: #ffffff;
}


.carousel-caption .text-4 a {
    text-decoration: none;
    color: #ffffff;
}


.navbar-nav .nav-item .nav-link {
    padding: 15px;
    border: 1px solid #26a26f;
}


.navbar-nav .nav-item .nav-link:hover {
    border-bottom: 1px solid white;
}



/*下面是轮播图的Boot4组件*/

/*这个类，组件里自带了absolute，我这里修改的是文字上移的位置*/
.carousel-caption {
    bottom: 32% !important;
}

/* Make the image fully responsive 让图片全屏展示*/
.carousel-inner img {
    width: 100%;
    height: 100%;
}

.carousel-inner .text {
    text-align: center;
    font-weight: bold;
    font-size: 2.5vw;
    color: #ffffff;
}

.carousel-inner .text-2 {
    text-align: center;
    font-weight: bold;
    font-size: 3vw;
    letter-spacing: 2px;
    color: #ffffff;
}

.carousel-inner .text-2 span {
    font-size: 4.5vw;
    letter-spacing: 2px;
    color: #ffffff;
}


.carousel-inner .text-3 {
    text-align: center;
    font-weight: bold;
    font-size: 6.5vw;
    font-family: MicrosoftJhengHei;
    color: #ffffff;
}


.carousel-inner .text-4 {
    text-align: center;
    font-size: 5.5vw;
    font-family: MicrosoftJhengHei;
    letter-spacing: 2px;
    color: #ffffff;
}


.container.intro {
    margin-bottom: 120px;
}