Find the custom theme on the official website >>> Only replace the theme color >>> Click the online theme generation tool
and click to switch the theme color (set your own theme color) >>> Click the switch button to preview the effect >>> After debugging, click to download the theme> >> Unzip the theme package
Create a new folder theme under the project >>> Copy all the decompressed files to this folder >>> Just reference it in Main.js
import './assets/theme/element/index.css'