我正在引导程序中创建登录页面，因此我添加了固定的导航栏，其中右侧有登录表单，登录表单为导航栏增加了更多的高度，实际上我使用了位置移动到顶部，但导航栏的高度不是减少（我也尝试过margin-top和padding-top），并且我想更改导航栏的颜色（我尝试通过使用background-color和！important属性更改导航栏的颜色）如何解决此问题
这是我的代码
<html>
<head>
<title>MyLandingPage</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
<link href="https://fonts.googleapis.com/css?family=Pacifico" rel="stylesheet">
<link rel="stylesheet" href="http://s.mlcdn.co/animate.css">
<style>
*{
margin: 0;
padding: 0;
position: relative;
}
.navbar-brand.navbar-header{
font-size:30px;
color:black;
}
.navbar{
background-color: #5b4282;
}
#bodycontainer{
background-image:url(wood.jpg);
width:100%;
background-size:cover;
}
form{
position:relative;
top:-50px;
}
#myheader h1{
font-size: 60px;
color:white;
font-weight:bold;
text-align:center;
margin-top:250px;
font-family: 'Pacifico', cursive;
}
#txt1{
text-align:center;
color:black;
font-weight:bold;
}
#txt2{
text-align:center;
color:black;
font-weight:bold;
}
#txt3{
text-align:center;
color:black;
font-weight:bold;
}
#txt4{
text-align:center;
color:black;
font-weight:bold;
}
.mybutton{
margin-left:250px;
}
</style>
</head>
<body>
<div class="container">
<div class="navbar navbar-default navbar-fixed-top">
<div class="navbar-brand navbar-header">
My@PP
</div>
<div class="collapse navbar-collapse" id="navbar-example">
<ul class="nav nav-pills">
<li class="active"><a href="">Link 1</a></li>
<li><a href="#">Link 2</a></li>
<li><a href="#">Link 3</a></li>
<li><a href="#">Link 4</a></li>
<li><a href="#">Link 5</a></li>
</ul>
<form class="navbar-form navbar-right" id="myform">
<input type="email" placeholder="[email protected]" class="form-control"/>
<input type="password" placeholder="*********" class="form-control"/>
<button type="button" class="btn btn-info">Log-In</button>
</form>
</div>
<button class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
</div>
<div class="container" id="bodycontainer">
<div class="row">
<div class="col-md-6 col-md-offset-3" id="myheader">
<h1 class="animated ZoomIn infinite ">MY APPLICATION</h1>
<p class="lead" id="txt1">This Why You Should Download The App</p>
<p id="txt2">For more Information about the app please scroll down the more to access the information you can get the idea about it</p>
<p id="txt3">If u are intrested please join our maling list</p>
<br/> <br/> <br/>
<form class="">
<div class="input-group">
<span class="input-group-addon" id="basic-addon1">@</span>
<input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
</div>
</form>
<button type="button" class="btn btn-info btn-lg mybutton">Submit</button>
</div>
</div>
</div>
<div class="container">
<div class="row">
<h1 id="txt4">Why this app is Osome...?</h1>
</div>
</div>
<script>
$("#bodycontainer").css("height",$(window).height());
</script>
</body>
</html>
解决方案是用css值覆盖来自引导程序的默认css值。
这里的navbar类控制着导航栏的最小高度和彩色背景色，因此更改其CSS属性可以解决您的问题。
我已经做到了这一点：
.navbar {背景：红色；max-height：50像素；}
将上面的CSS放在您的页面中，它将根据您的需要进行工作。您可以根据需要更改值。
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