Reply To: make post the same width as page?

[Binaya D]

Hi There,

No, do not edit the core file of parent theme, we are telling that use the child theme or custom css or you can follow this link https://wordpress.org/plugins/simple-custom-css/ and download the plugin and use it in your WordPress/site after that please follow the following steps:
Go to Dashboard=> Appearance=> Custom css=> Then copy and paste the css which we have provided to you=> And click in the update custom css.
We hope you understand.

Thanks