Adding bottom border on LiveEditor and Blog page Header

Copy below CSS snippet:

.banner { 
box-shadow: 1px 4px 9px -5px rgb(97, 97, 97); 
-moz-box-shadow: 1px 4px 9px -5px rgb(97, 97, 97); 
}

For LiveEditor Pages

Paste snippet to the LiveEditor of the page >> Page Settings >> Other Scripts >> Custom CSS (from dropdown). Click Update.

For Blog Pages

Paste the snippet to OptimizePress >> Blog Settings >> Modules >> Other Scripts >> Custom CSS (from dropdown). Save your work.