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Customize the Dialog appearance in Blazor Dialog component

You can customize the dialog appearance by providing dialog template as string or HTML element to the Content template property. In the following code block, dialog is customized as error window appearance.

@using Syncfusion.Blazor
@using Syncfusion.Blazor.Popups
@using Syncfusion.Blazor.Buttons

<SfButton @onclick="@OnClicked">Open Dialog</SfButton>
<SfDialog @bind-Visible="@IsVisible" Width="400px" ShowCloseIcon="true" CloseOnEscape="true" >
        <Header> File and Folder Rename</Header>
        <Content> <div class='msg-wrapper  col-lg-12'><span class='e-icons close-icon col-lg-2'></span><span class='error-msg col-lg-10'>Can not rename 'pictures' because a file or folder with that name already exists</span></div><div class='error-detail col-lg-8'><span>Specify a different name</span></div> </Content>
    <DialogAnimationSettings Effect="@Effects" Duration=400></DialogAnimationSettings>
        <DialogButton OnClick="@OnClick">
            <DialogButtonModel Content="Close" IsPrimary="true"></DialogButtonModel>

    .e-btn.e-flat.e-primary, .e-btn.e-flat.e-primary:focus {
        background-color: #317ab9;
        border-color: #265f91;
        color: #fff;
    .e-btn.e-flat.e-primary:hover, .e-btn.e-flat.e-primary:active {
        background-color: #21527d;
        border-color: #163854;
        color: #fff;
    .close-icon {
        width: 24px;
        height: 24px;
        position: relative;
        display: inline-block;
    .error-msg {
        color: #66afe9;
        display: inline-block;
        position: relative;
        top: -20px;
        left: 10px;
    .error-detail {
        position: relative;
        left: 56px;
        margin: 0 0 21px;
    .e-icons.close-icon.col-lg-2:before {
        content: '\e7e9';
        font-size: 26px;
        position: relative;
        left: 1px;
        bottom: 18px;
    .e-dialog .e-footer-content {
        background-color: #f8f8f8;

    .e-dialog.e-control.e-popup, .e-dialog.e-control.e-popup .e-dlg-header-content {
        background-color: #d9edf7;
    .e-dialog.e-control.e-popup {
    .e-dialog.e-control .e-dlg-header-content {
        padding: 10px;
    .e-dialog.e-control .e-footer-content {
        padding: 8px 12px;

    .e-dialog.e-control .e-dlg-content {
        padding: 15px 0 0;

    .msg-wrapper.col-lg-12 {
        margin-top: 20px;

@code {
    private bool IsVisible { get; set; } = true;

    public DialogEffect Effects = DialogEffect.Zoom;
    private void OnClick()
        this.IsVisible = false;
    private void OnClicked() {
        this.IsVisible = true;

The output will be as follows.