Customize Fermion Theme with Custom CSS

You may want to change certain aspects of your website’s appearance with a custom CSS (Cascading Style Sheet) file. In this document we will show you how to add a custom CSS to your VCP MVC / Razor Pages solution to replace the existing Fermion Theme CSS. By adding your custom CSS, you will modify your website’s overall look.

Be aware that custom CSS must contain all the styles that Fermion Theme uses. If you just want to overwrite some styles, you can use global-styles.css in the wwwroot folder of your web project.

How to Add a Custom CSS?

Download Fermion Theme Source-Code

Download the Fermion Theme source-code to retrieve the existing CSS files. To do this create a new folder named as FermionTheme and run the following VCP CLI command inside the FermionTheme folder:

vcp get-source Verto.FermionTheme

Copy to Your Project

In the following folder, you will find all the Fermion CSS files.

src\Verto.Vcp.AspNetCore.Mvc.UI.Theme.Fermion\Themes\Fermion\Global\styles

The default theme uses Fermion6.css.
Create a folder named styles under the wwwrootfolder of your web project.
Copy Fermion6.css to the wwwroot/styles folder and rename it to custom.css.

Customize the CSS

Open custom.css and find the .lp-opened-sidebar style. Comment out the existing background style and add the following background style which changes the main menu's background color.

 background: linear-gradient(7deg, #9f3049, #84a21f);

Set the Style Path

Add the following code to the ConfigureServices in the YourProjectWebModule.cs .

Configure<FermionThemeOptions>(options =>
{
    options.StylePath = "/styles/custom.css";
});

Run the Web Project

The main menu's background color changed. With this approach, you can change your website’s overall look.