Add css custom style specific to a page in wordpress
You can add custom styles to a specific page in wordpress without affecting the whole website.
Go to Appearance-> Customize->Additional CSS
/* add your custom css style code here*/
Here 1047 is the page id which you can get from the url when you edit the page:
Change page id as per your webpage, write custom css code and click publish.
Hope this was helpful. Feel free to get in touch in case of any questions here.