<style type="text/css">
.errorBackground
{
    background: #000;
    opacity: 0.6;
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    height: 100%;
}
.errorModal
{
    position: absolute;
    top: 20%;
    left: 30%;
    background: rgb(46, 50, 56);
    border-radius: 7px;
    border: 1px solid rgb(28,30, 34);
}
    .lblerrortitle
    {
        display: block;
        font-size: 28px;
        border-bottom: 1px solid rgb(28, 30, 34);
        padding-top: 10px;
        padding-left: 10px;
        padding-bottom: 15px;
    }
    .lblerrormessage
    {
        margin-top: 10px;
        padding-left: 10px;
        padding-bottom: 20px;
        padding-right: 10px;
        display: block;
        border-bottom: 1px solid rgb(28, 30, 34);
    }
    .modal-controls
    {
        padding: 10px;
        float: right;
    }
.button
{
    color: #fff;
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #434654;
    background: transparent;
    background: -moz-linear-gradient(top, #889094 0%, #70787e 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#889094), color-stop(100%,#70787e)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #889094 0%,#70787e 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #889094 0%,#70787e 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #889094 0%,#70787e 100%); /* IE10+ */
    background: linear-gradient(to bottom, #889094 0%,#70787e 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#889094', endColorstr='#70787e',GradientType=0 ); /* IE6-8 */
}
</style>

<asp:Panel runat="server" id="ErrorBackground" visible="false" CssClass="errorBackground"> </asp:Panel>
<asp:Panel runat="server" id="ErrorModal" visible="false" CssClass="errorModal">
    <asp:Label runat="server" ID="lblErrorAction" CssClass="lblerrortitle"></asp:Label>
    <asp:Label runat="server" ID="lblErrorMessage" CssClass="lblerrormessage"></asp:Label>
    <div class="modal-controls">
        <asp:LinkButton runat="server" ID="lnkMoreDetail" Text="More Detail" OnClick="lnkMoreDetail_Click"></asp:LinkButton> &nbsp;<asp:Button runat="server" ID="btnErrorAction" CssClass="button" Text="Retry" OnClick="btnErrorAction_Click" />
    </div>
</asp:Panel>