How to remove lines between menu items

Olivia, you already have the CSS code I suggested above. You just need to correct /change your code from:

#menubar

.sitenav ul li a{ padding:20px 25px; display:block; 
  color:#222; border-right:none;}

to:

#menubar .sitenav ul li a{
	padding: 20px 25px !important;
	border-right: none !important;
}