What is the method to avoid loading the entire application after making CSS modifications?

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One method to avoid loading the entire application after making CSS modifications is to use a tool called "hot reloading". Hot reloading is a process that injects updated CSS code directly into the browser without requiring a full page reload.

To use hot reloading, you can use a CSS preprocessor like Sass or Less, and a task runner like Gulp or Grunt. These tools can be configured to watch your CSS files for changes and automatically compile and inject the updated CSS into your application.

Another option is to use a CSS-in-JS library like Styled Components or Emotion. These libraries allow you to write CSS code directly in your JavaScript files, and the styles are dynamically injected into the page as the component renders. This means that any changes you make to the CSS code are immediately reflected in the browser, without requiring a full page reload.