我不确定如何更改网页的背景颜色。我一直在研究答案，他们一直指着bootstrap.css这是可以理解的，但是，我不知道如何将这些分配给特定的Web表单。
这是我在bootstrap.css中放置的代码示例
body {
margin: 0;
background-color:#183adb;
}
这是我的网页，标记代码
<%@ Page Title="AddProject" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="AddProject.aspx.cs" Inherits="help.AddProject" %>
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<div class="Jumbotron">
<h1>CREATE A NEW PROJECT:</h1>
</div>
<div class ="Container-fluid">
<br />
<div class ="Row">
<asp:Label ID="lblprojectName" runat="server" Text="Project Name"></asp:Label>
</div>
<div class ="Row">
<asp:TextBox ID="txtProjectName2" runat="server" Width="517px" AutoPostBack="True" ForeColor="Black" AutoCompleteType="Disabled"></asp:TextBox>
</div>
<br />
<div class ="Row">
<asp:Label ID="lblProjectDesc" runat="server" Text="Project Description"></asp:Label>
</div>
<div class ="Row">
<asp:TextBox ID="txtProjectDesc" runat="server" Height="52px" TextMode="MultiLine" Width="521px" AutoCompleteType="Disabled"></asp:TextBox>
</div>
<br />
<div class ="Row">
<asp:Label ID="lblDate" runat="server" Text="Start Date"></asp:Label>
</div>
<div class ="Row">
<asp:TextBox ID="txtDate" runat="server" Width="164px" AutoCompleteType="Disabled"></asp:TextBox> <asp:Button ID="btnChangeDate" runat="server" Text="Change" OnClick="btnChangeDate_Click" />
</div>
<asp:Calendar ID="calStartDate" runat="server" OnSelectionChanged="calStartDate_SelectionChanged" Visible="False"></asp:Calendar>
<br />
<div class ="Row">
<asp:Label ID="lblFinishDate" runat="server" Text="Finish Date"></asp:Label>
</div>
<div class ="Row">
<asp:TextBox ID="txtFinishDate" runat="server" Width="164px" AutoCompleteType="Disabled"></asp:TextBox> <asp:Button ID="btnChangeDate2" runat="server" Text="Change" OnClick="btnChangeDate2_Click" />
</div>
<asp:Calendar ID="CalFinishDate" runat="server" OnSelectionChanged="CalFinishDate_SelectionChanged"></asp:Calendar>
</div>
<div class = "Container-fluid">
<br />
<div class ="Row">
<asp:Button ID="btnCreateProject" runat="server" Text="Save & Add" Height="40px" Width="94px" OnClick="btnCreateProject_Click" />
<asp:Button ID="btnClearProject" runat="server" Text="Clear all" Height="40px" Width="94px" OnClick="BtnClearProject_Click" />
</div>
</div>
</asp:Content>
将CSS代码直接放在<head></head>标记内的Site.Master页面中，而不是放在bootstrap.css中：
<style>
body {
margin: 0;
background-color: #183adb;
}
</style>