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.