Gridview is out of content place holder in firefox browser - asp.net

Question

My code sample is given below!
<%# Page Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" CodeBehind="SMS_Table.aspx.cs" Inherits="Web_sms_alert.SMS_Table" %>
<%# Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp"%>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<asp:Label ID="Label1" runat="server" Font-Bold="true" Text="From: "></asp:Label>
<asp:TextBox ID="tbDatefrom" Font-Names="Segoe UI" runat="server"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender1" Format="yyyy-MM-dd" DefaultView="Days" TargetControlID="tbDatefrom" runat="server">
</asp:CalendarExtender>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="tbDatefrom" Font-Bold="true" ErrorMessage="*"></asp:RequiredFieldValidator>
<asp:Label ID="Label2" runat="server" Font-Bold="true" Text="To: "></asp:Label>
<asp:TextBox ID="tbDateTo" Font-Names="Segoe UI" runat="server"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender2" Format="yyyy-MM-dd" DefaultView="Days" TargetControlID="tbDateTo" runat="server">
</asp:CalendarExtender>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="tbDateTo" Font-Bold="true" ErrorMessage="*"></asp:RequiredFieldValidator>
<asp:Button runat="server" ID="btnSearch" CssClass="buttons" Text="Search" OnClick="btnSearchDW" /></br>
<div style="float: left; width: 98%; height: 30px;"><asp:CheckBox ID="cbDateRange" runat="server" Font-Bold="true" Font-Names="Segoe UI" Text="Date Range" /> <asp:CheckBox ID="cbsmsday" Text="SMS/Day" Font-Bold="true" Font-Names="Segoe UI" runat="server" /></div>
<asp:UpdatePanel ID="upl" runat="server">
<ContentTemplate>
<asp:GridView ID="GridviewSMS_Table" runat="server"
EnableSortingAndPagingCallbacks="false" AllowPaging="true" PageSize="20"
BorderColor="Chocolate" BorderStyle="None" OnPageIndexChanging="GridView1_PageIndexChanging"
BorderWidth="1px" CellPadding="3" GridLines="Vertical" Font-Names="Segoe UI" Width="354px">
<RowStyle BackColor="Wheat" ForeColor="Black" HorizontalAlign="Left" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="btnLinkView" runat="server" OnClick="btnLinkView_click">Text</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
<PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" Font-Size="Medium" />
<EditRowStyle BackColor="#000084" Font-Bold="True" ForeColor="White" Font-Size="Medium" />
</asp:GridView>
<asp:Panel ID="PanelText" runat="server" CssClass="ModalPopup" style="display:none">
<table border="1" align="center" style="border-color: #FF6600">
<tr>
<td> <asp:Label ID="lblTextShow" ForeColor="Black" Text="Text Message: " runat="server"></asp:Label></td>
<td><asp:TextBox ID="tbMessage" runat="server" TextMode="MultiLine" ForeColor="Black" Height="150px" Width="200px"></asp:TextBox></td>
</tr>
<tr align="center" valign="middle">
<td colspan="2">
<asp:Button ID="btnClose" runat="server" ForeColor="Black" Text="Close" />
</td> </tr>
</table>
</asp:Panel>
<asp:Button ID="btncontrol" runat="server" style="display:none" />
<asp:ModalPopupExtender ID="mpeMessage" runat="server" Enabled="true"
TargetControlID="btncontrol" PopupControlID="PanelText"
BackgroundCssClass="ModalBackground" CancelControlID="btnClose">
</asp:ModalPopupExtender>
</ContentTemplate>
</asp:UpdatePanel>
<div align="center">
<asp:Label ID="lblTotalDp" Font-Bold="true" Visible="false" ForeColor="Black" runat="server" Text="Total: "></asp:Label>
<asp:Label ID="lbltotal" Font-Bold="true" Visible="false" ForeColor="Black" runat="server"></asp:Label></div>
</div>
the page is shown in google chrome and IE good Like below
while in fire fox the grid-view is outside content place holder of masterpage! Like below
I didnt understand why this problem i am facing??? Please help me out of this.

Answer 1

remove from <div style="float: left the float:left
I do not see any reason for that, and the float is making this problem.