我有一个使用 bootstrap 主题的 html 页面。我对 CSS 样式有一个小问题。这是我从未遇到过的问题。问题是背景不会在页面加载时填满页面，只有在调整页面大小时它才会填满页面。有什么建议么？
谢谢，
詹姆斯·海兰
这里是_Layout.cshtml代码；
@{
ViewData["Title"] = "Home Page";
}
<!DOCTYPE html>
<html lang="en">
<head>
<style>
#side-navbar-footer {
position: fixed;
bottom: 0;
padding: 10px 15px;
display: block;
font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
font-size: 14px;
line-height: 1.42857143;
border-top: 1px solid black;
}
.dropdown-toggle{
color:black;
}
#page-wrapper {
background: radial-gradient(white 10%, grey );
background-size: cover;
}
</style>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<title>HBL Website</title>
<!-- Bootstrap Core CSS -->
<link href="../vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<!-- MetisMenu CSS -->
<link href="../vendor/metisMenu/metisMenu.min.css" rel="stylesheet">
<!-- Custom CSS -->
<link href="../dist/css/sb-admin-2.css" rel="stylesheet">
<!-- Custom Fonts -->
<link href="../vendor/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div id="wrapper">
<!-- Navigation -->
<nav id="navbar-top" class="navbar navbar-default navbar-static-top" role="navigation" style="margin-bottom: 0">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="index.html">Hylands Biggest Loser</a>
</div>
<!-- /.navbar-header -->
<ul class="nav navbar-top-links navbar-right">
<!-- /.dropdown -->
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">
<i class="fa fa-user fa-fw"></i> <i class="fa fa-caret-down"></i>
</a>
<ul class="dropdown-menu dropdown-user">
<li>
<a href="#"><i class="fa fa-user fa-fw"></i> User Profile</a>
</li>
<li>
<a href="#"><i class="fa fa-gear fa-fw"></i> Settings</a>
</li>
<li class="divider"></li>
<li>
<a asp-controller="Account" asp-action="Login"><i class="fa fa-sign-out fa-fw"></i> Login</a>
</li>
</ul>
<!-- /.dropdown-user -->
</li>
<!-- /.dropdown -->
</ul>
<!-- /.navbar-top-links -->
<div class="navbar-default sidebar" role="navigation">
<div class="sidebar-nav navbar-collapse">
<ul class="nav" id="side-menu">
<li class="sidebar-search">
<div class="input-group custom-search-form">
<input type="text" class="form-control" placeholder="Search...">
<span class="input-group-btn">
<button class="btn btn-default" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
</li>
<li>
<a href="#"><i class="fa fa-line-chart"></i> My Progress<span class="fa arrow"></span></a>
<ul class="nav nav-second-level">
<li>
<a href="#">Weights</a>
</li>
<li>
<a href="#">Target Weight</a>
</li>
<li>
<a href="#">My Summary</a>
</li>
<li>
</ul>
</li>
<li>
<a href="#"><i class="fa fa-users"></i> My Group<span class="fa arrow"></span></a>
<ul class="nav nav-second-level">
<li>
<a href="#">Members</a>
</li>
<li>
<a href="#">Summary</a>
</li>
<li>
</ul>
</li>
<li>
<a style="bottom:0" href="tables.html"><i class="fa fa-copyright"></i> Needlecast Ltd. 2017</a>
</li>
</div>
<!-- /.sidebar-collapse -->
</div>
<!-- /.navbar-static-side -->
</nav>
<!-- Page Content -->
<div id="page-wrapper">
<div class="container-fluid">
<div class="row">
<div class="col-lg-12">
@RenderBody()
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
</div>
<!-- /.container-fluid -->
</div>
<!-- /#page-wrapper -->
</div>
<!-- /#wrapper -->
<!-- jQuery -->
<script src="../vendor/jquery/jquery.min.js"></script>
<!-- Bootstrap Core JavaScript -->
<script src="../vendor/bootstrap/js/bootstrap.min.js"></script>
<!-- Metis Menu Plugin JavaScript -->
<script src="../vendor/metisMenu/metisMenu.min.js"></script>
<!-- Custom Theme JavaScript -->
<script src="../dist/js/sb-admin-2.js"></script>
@RenderSection("Layout", required: false);
@RenderSection("Scripts", required: false)
<environment names="Development">
<script src="~/lib/jquery/dist/jquery.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>
</environment>
<environment names="Staging,Production">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-2.2.0.min.js"
asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
asp-fallback-test="window.jQuery"
crossorigin="anonymous"
integrity="sha384-K+ctZQ+LL8q6tP7I94W+qzQsfRV2a+AfHIi9k8z8l9ggpc8X+Ytst4yBo/hH+8Fk">
</script>
<script src="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.7/bootstrap.min.js"
asp-fallback-src="~/lib/bootstrap/dist/js/bootstrap.min.js"
asp-fallback-test="window.jQuery && window.jQuery.fn && window.jQuery.fn.modal"
crossorigin="anonymous"
integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa">
</script>
<script src="~/js/site.min.js" asp-append-version="true"></script>
</environment>
</body>
</html>
这里是 Index.cshtml 代码(这不是导致问题的原因)；
@{
ViewData["Title"] = "About";
}
<style>
*{
text-align:center;
}
</style>
<body >
<img src="~/img/asset 1.jpg"/>
<h1>Welcome to Hylands Biggest Loser!</h1>
<h2>Click the buttons on the side. They will allow you to view your weights, progress, and your overall weekly summary.</h2>
<h2>You can also view the other members in your group, as well as a weekly summary for all members.</h2>
</body>
最佳答案
将所有主要包装元素的高度设置为 100%，并且背景应始终至少占据页面的 100%。
添加这个CSS样式:
html, body, #wrapper, #page-wrapper { height: 100%; }
关于css - 使用 Bootstrap 主题时出现异常背景问题 - ASP.NET Core，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43941128/