How do I add a key line to the bottom of a section

Site URL: https://mauve-crane-alan.squarespace.com

Looking to add a key line to the bottom of a section with CSS.

1 hour ago, Jordanheid said:

Site URL: https://mauve-crane-alan.squarespace.com

Looking to add a key line to the bottom of a section with CSS.

what is your site url?

https://pike-grouse-hzmx.squarespace.com/

password: PIB

9 hours ago, Jordanheid said:

https://pike-grouse-hzmx.squarespace.com/

password: PIB

It's incorrect, and what is the key line you need look like

Sorry wrong site. It's this:
https://mauve-crane-alan.squarespace.com

Password: PIB

In the attached image the grey and green are different sections. Would like to add the key line at the bottom of the grey.

13 hours ago, Jordanheid said:

Sorry wrong site. It's this:
https://mauve-crane-alan.squarespace.com

Password: PIB

In the attached image the grey and green are different sections. Would like to add the key line at the bottom of the grey.

 

Add an arrow here?