Internal CSS
The internal CSS is used to add a unique style to a single document.
It is defined in the <head> section of the HTML page inside the <style> tag.
Advantages of Internal CSS:
IDs and classes can be used in internal style sheets.
You do not need to upload numerous files.
They might take precedence over outside style sheets.
Disadvantages of Internal CSS:
They are useful for only the page they are specified on.
Internal style sheets increase page load times.