colspan screwing up css asp.net table

Question

I created a table to organize my items on a page. The page is an edit page for a property. I used colspan to expand rows and put a textbox within rows and set the textbox wdith to 100%, However, the textbox width still only takes the space of 1 column not 3 columns like I expected here is the code

 <table align="left" style="width: 100%; float: left" class="FormFormatTable">

    <tr>
        <td style="width: 10%; height: 60px">Alert Name</td>
        <td colspan="3" style=" ">
            <asp:TextBox CssClass="inputBoxes" ID="txtBox_alertName" runat="server"></asp:TextBox>
        </td>
    </tr>
    <tr>
        <td style="width: 10%; height: 60px;">Alert</td>
        <td style="height: 60px; ">
            <asp:DropDownList ID="ddl_AlertTime" runat="server">
                <asp:ListItem Value="1">After</asp:ListItem>
                <asp:ListItem Value="0">Immediately</asp:ListItem>
            </asp:DropDownList>
        </td>
        <td style="height: 60px; ">
            <input id="demo_vertical0" type="number"/></td>
        <td style="height: 60px">
            <asp:DropDownList ID="DropDownList1" runat="server">
                <asp:ListItem>Seconds</asp:ListItem>
                <asp:ListItem>Minutes</asp:ListItem>
                <asp:ListItem>Hours</asp:ListItem>
            </asp:DropDownList>
        </td>
    </tr>
    <tr>
        <td style="width: 10%">Severity</td>
        <td style=" height: 60px"" >
            <asp:DropDownList ID="ddl_Severity" runat="server">
                <asp:ListItem Value="1">After</asp:ListItem>
                <asp:ListItem Value="0">Immediately</asp:ListItem>
            </asp:DropDownList>
        </td>
        <td style="">&nbsp;</td>
        <td>&nbsp;</td>
    </tr>
    <tr style="height:60px">
        <td style="width: 10%">Receipients</td>
        <td colspan="3" style="">
            <asp:TextBox CssClass="inputBoxes" ID="txtBox_Receipients" runat="server"></asp:TextBox>
        </td>
    </tr>
    <tr style="height:60px">
        <td style="width: 10%">Subject Title</td>
        <td colspan="3" style="">
            <asp:TextBox CssClass="inputBoxes" ID="txtBox_SubjectTitle" runat="server"></asp:TextBox>
        </td>
    </tr>
    <tr style="height:60px">
        <td style="width: 10%">Alert Messsage</td>
        <td colspan="3" style="">
            <asp:TextBox CssClass="inputBoxes" ID="txtBox_AlertMessage" runat="server"></asp:TextBox>
        </td>
    </tr>
    <tr style="height:60px">
        <td style="width: 10%; ">Notification Window</td>
        <td style=" ">
            <asp:TextBox CssClass="inputBoxes"  ID="txtBox_NotificationWindow" runat="server"></asp:TextBox>
        </td>
        <td style=" "></td>
        <td style="height: 60px"></td>
    </tr>
    <tr style="height:60px">
        <td style="width: 10%; ">Notification Frequency</td>
        <td style=" ">
            <input id="demo_vertical" type="number"/>
        </td>
        <td style=" "></td>
        <td style="height: 60px"></td>
    </tr>
    <tr style="height:60px">
        <td style="width: 10%">Fields to Display in Details</td>
        <td colspan="3" style="">
            <asp:TextBox CssClass="inputBoxes" ID="txtBox_SubjectTitle3" runat="server"></asp:TextBox>
        </td>
    </tr>
</table>

css is simple just this

.inputBoxes {
    width: 100%;
}

why is this?

a screenshot of my page on my computer

Answer 1

You have an extra quote in the following line (the cell definition that contains your ddl_Severity control).

<td style=" height: 60px"" >

Maybe remove this quote, and see if that fixes it.

Answer 2

In you HTML the Alert Name , Receipients ,Subject Title ,Alert Messsage ,Fields to Display in Details TextBoxs take 3 columns .

Notification Window take one columns because you don't set colspan

you must add colspan="3" to your td of notfication

 <td  colspan="3" style=" ">
        <asp:TextBox CssClass="inputBoxes"  ID="txtBox_NotificationWindow" runat="server"></asp:TextBox>
    </td>