[Graphene theme] botton border line

If you want to modify themes not custom, first create a Child Theme or active a Custom Style/CSS plugin for styles only.

I’ll put the css code in custom css field in the theme. Please tell me the code to hide the bottom border.

Is this what you’re looking for?

.entry-footer {
 border: 0;
}

yes, thanks, it is done. thanks again.