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abp/docs/en/UI/Blazor/Basic-Theme.md

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# 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 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)