Hello @mlmexpert,

To insert the borderline around the post and pages use below given CSS.

For this go to Admin Panel > Appearance > Customize > Additional CSS and paste below given CSS.

#primary {
    border: 1px solid #333;
    padding: 20px 15px;
}

You can change the border color and adjust the padding as per your requirement.

As for the front page, please explain properly where do you want to add the border since there are multiple sections. So please explain it with proper screenshot so that we can help you.

Hope this helps.

Best Regards!!

Have a good day 🙂 .

Hello @mlmexpert,

Can you post the link of the page that you want to set the border for so that we can provide the precise fix?

Thank you 🙂 .

Best Regards!!