# Blazor UI: Basic Theme

The Basic Theme is a theme implementation for the Blazor UI. It is a minimalist theme that doesn't add any styling on top of the plain [Bootstrap](https://getbootstrap.com/). You can take the Basic Theme as the **base theme** and build your own theme or styling on top of it. See the *Customization* section.

> If you are looking for a professional, enterprise ready theme, you can check the [Lepton Theme](https://commercial.abp.io/themes), which is a part of the [ABP Commercial](https://commercial.abp.io/).

> See the [Theming document](Theming.md) to learn about themes.

## Installation

**This theme is already installed** when you create a new solution using the [startup templates](../../Startup-Templates/Index.md). If you need to manually install it, follow the steps below:

* Install the [Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme](https://www.nuget.org/packages/Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme) NuGet package to your web project.
* Add `AbpAspNetCoreComponentsWebAssemblyBasicThemeModule` into the `[DependsOn(...)]` attribute for your [module class](../../Module-Development-Basics.md) in the your Blazor UI project.
* Use `Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme.Themes.Basic.App` as the root component of your application in the `ConfigureServices` method of your module:

````csharp
var builder = context.Services.GetSingletonInstance<WebAssemblyHostBuilder>();
builder.RootComponents.Add<App>("#ApplicationContainer");
````

`#ApplicationContainer` is a selector (like `<div id="ApplicationContainer">Loading...</div>`) in the `index.html`.

## The Layout

![basic-theme-application-layout](../../images/basic-theme-application-layout.png)

Application Layout implements the following parts, in addition to the common parts mentioned above;

* [Branding](Branding.md) Area
* Main [Menu](Navigation-Menu.md)
* Main [Toolbar](Toolbars.md) with Language Selection & User Menu
* [Page Alerts](Page-Alerts.md)

## Customization

You have two options two customize this theme:

### Overriding Styles / Components

In this approach, you continue to use the the theme as NuGet and NPM packages and customize the parts you need to. There are several ways to customize it;

#### Override the Styles

You can simply override the styles in the Global Styles file of your application.

#### Override the Components

See the [Customization / Overriding Components](Customization-Overriding-Components.md) to learn how you can replace components, customize and extend the user interface.

### Copy & Customize

You can run the following [ABP CLI](../../CLI.md) command in **Blazor WebAssembly** project directory to copy the source code to your solution:

`abp add-package Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme --with-source-code --add-to-solution-file`

Then, navigate to downloaded `Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme` project directory and run:

`abp add-package Volo.Abp.AspNetCore.Components.Web.BasicTheme --with-source-code --add-to-solution-file`

----

Or, you can download the [source code](https://github.com/abpframework/abp/blob/dev/modules/basic-theme/src/Volo.Abp.AspNetCore.Components.WebAssembly.BasicTheme) of the Basic Theme, manually copy the project content into your solution, re-arrange the package/module dependencies (see the Installation section above to understand how it was installed to the project) and freely customize the theme based on your application requirements.

## See Also

* [Theming](Theming.md)