Login page design issue when i add authorization tag into web.config

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I designed one Login Page when i add authorization tag into web.config file the total design would changed like images and icons are not appeared.
i am using this code for authorization

<authentication mode="Forms">
        <forms loginUrl="LoginPage.aspx" timeout="2880" />
      </authentication>
      <authorization>
        <deny users="?"/>
<allow users = "*"/>
      </authorization>

Please share any idea to me.

Please check my login page aspx code:

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <link href="Styles/LOUPeStyles.css" rel="stylesheet" type="text/css" />
    <link href="CSS/bootstrap.css" rel="stylesheet" type="text/css" />
    <link href="CSS/bootstrap-responsive.css" rel="stylesheet" type="text/css" />
    <style type="text/css">
     
      html, body {
        background-color: #eee;
      }
      body {
        padding-top: 80px; 
      }
      .container {
        width: 250px;
      }

      .container > .contentt {
        background-color: #fff;
        padding: 0 0 12px;
        margin: 250px -40px; 
        -webkit-border-radius: 10px 10px 10px 10px;
           -moz-border-radius: 10px 10px 10px 10px;
                border-radius: 10px 10px 10px 10px;
        -webkit-box-shadow: 0 1px 2px rgba(0,0,0,.15);
           -moz-box-shadow: 0 1px 2px rgba(0,0,0,.15);
                box-shadow: 0 1px 2px rgba(0,0,0,.15);
      }
      .contentt .form-signin-heading
{
    margin-bottom: 20px;
    background-color: #0082AA;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14pt;
    color: #FFFFFF;
    font-weight: normal;
    text-indent: 20px;
}
	  .login-form {
		margin-left: 40px;
	  }
	
	  #ContentPlaceHolder1_btnlogin {
        margin-top: -30px;
        margin-left: 186px;
      }
    </style>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    
    <div class="container">

      <div class="contentt">
        <h2 class="form-signin-heading">Sign in </h2>
         <asp:Label ID="lblmsg" runat="server"></asp:Label>
        <div class="login-form">
         <div class="input-prepend">
              <span class="add-on"></span>
               <asp:TextBox ID="txtpassword" runat="server"  
                    placeholder="Password" TextMode="Password"></asp:TextBox>
             </div>
             <asp:RequiredFieldValidator ID="rfvPWD" runat="server" 
        ControlToValidate="txtpassword" ErrorMessage="Please enter Password" 
        ForeColor="#CC3300" ValidationGroup="validate" EnableClientScript="false" />
            <label class="checkbox">
                <asp:CheckBox ID="rememberchecked" runat="server" Text="Keep me signed in"  />
            </label>
            <asp:Button ID="btnlogin" runat="server" Text="Login" 
            CssClass="btn btn-primary" onclick="btnlogin_Click" />
            </div>
      </div>

    </div> <!-- /container -->
    ^__i class="icon-user">
</asp:Content>