How to Insert HTML Script on blogger post or page
If you want to add HTML Script to your blogger website, blogger has a feature directly to it. You can do this by clicking on the compose mode option on the left side of the post or page in your blogger and converting it to HTML mode and adding your custom HTML scripts to the blogger post or page of course wherever you want.
How to Insert CSS Script on blogger post or page
Your blogger post or page
Switch from composing mode to HTML mode. Then add the CSS Script you want to your post. Inputs the <style> tag at the beginning of your CSS Script. Then input the <\ style> tag where your CSS Script can be. Doing so will activate the CSS Script you added to your blogger post or page. Just keep in mind that this can be used for all CSS scripts.