如何修改某些引导程序元素

我正在为我高中的机器人团队开发一个网站。我有两个jumbotron元素，但我需要在不改变另一个的情况下修改其中一个。我该怎么做？

网站为www.robotichive3774.com

<!DOCTYPE html>
<html>
<head>
<title>Robotics Team 3774 Home</title>
<!-- Link to stylesheet -->
<link rel="stylesheet" type="text/css" href="bootstrap/css/bootstrap.css">
<link rel="stylesheet" type="text/css" href="css/index1.css">

<!-- Mobile Scaling -->
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<!-------------------- UNIFORM CODE ------------------------->
<!-- Navbar -->
<div class="navbar navbar-inverse navbar-fixed-top" role="navigation">
    <div class="container">
        <div class="navbar-header">
            <a class="navbar-brand" href="/Home">Team 3774</a>
        </div>
        <div class="navbar-collapse collapse" style="height: 0.866667px;">
            <ul class="nav navbar-nav">
                <li><a href="/Team Bio">Team Bio</a></li>
                <li><a href="/Our Robot">Our Robot</a></li>
                <li><a href="/Our Coach">Our Coach</a></li>
                <li><a href="/Gallery">Gallery</a></li>
                <li><a href="/Outreach">Outreach</a></li>
                <li><a href="/Youtube">Youtube</a></li>
            </ul>
        </div>
    </div>
</div>
<!-- Banner -->
<div class="jumbotron">
    <img src="/Images/Banner.png" class="img-responsive" alt="Responsive image">
</div>
<!----------------------------------------------------------->
<div class="jumbotron">
    <h1>Team 3774 Member Bio</h1>
    <p>Here you can find links to every member with some information on each of them.</p>
</div>
<div class="container">
    <div class="row">
        <div class="col-md-4">
            <h2>Abanoub Boules</h2>
            <p>Team Captain, Engineer, Coder</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Andre Bernardo</h2>
            <p>Head Engineer, Assistant Captain</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Leo Scarano</h2>
            <p>Head Coder, Head Web-master</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Andrew Wojtkowski</h2>
            <p>Coder, Web-master, Engineer</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Mina Hanna</h2>
            <p>Engineer, Coder</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Kenneth Rebbecke</h2>
            <p>Engineer, Documenter</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Kristen Kaldas</h2>
            <p>Coder, Head Documenter</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Melanie Aguilar</h2>
            <p>Secretary, Mascot</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Anish Patel</h2>
            <p>Engineer, Head 3D Modelling</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
        <div class="col-md-4">
            <h2>Furhan Ashraf</h2>
            <p>Financial Advisor, Engineer</p>
            <button type="button" class="btn btn-default">Read More</button>
        </div>
    </div>
</div>

</body>
</html>

我需要在网站顶部有一个jumbotron元素来包含这些元素，但我不能将这些元素应用到第二个jumboron。

.padding
 {
    padding-left:0;
    padding-right:0;
    padding-bottom:0;
}

将id选择器添加到您希望单独选择的id选择器中，例如id="top-jumbotron"

<!-- Banner -->
<div id="top-jumbotron" class="jumbotron">
    <img src="/Images/Banner.png" class="img-responsive" alt="Responsive image">
</div>

然后使用ID选择器应用CSS：

#top-jumbotron {
   padding-left:0;
   padding-right:0;
   padding-bottom:0;
}

请记住，ID在页面上必须是唯一的，这意味着您只能有一个#top-jumbotron、一个#bottom-jumbotron等。它们对于挑选需要特定样式或应用其他方法的唯一元素非常有用。

ID选择器由标签#表示，并且必须是页面唯一的
示例：#top-jumbotron

类选择器由句点.表示，可以应用于页面上的一个或多个元素
示例：.jumbotron

或者，您可以使用:first-child伪选择器（如下所示）在页面上挑选出第一个.jumbotron类：

.jumbotron:first-child
 {
    padding-left:0;
    padding-right:0;
    padding-bottom:0;
}

然而，对于您的情况，我建议使用特定的目标ID，这样您就知道它总是应用于正确的jumbotron。

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