/usr/share/cinnamom/theme/cinnamon.css
#panel {
color: #ffffff;
background-color: #555555;
font-size: 8.5pt;
font-weight: normal;
height: 25px;
Zameni #555555 sa rgba(0,0,0,0.35)
#panel {
color: #ffffff;
background-color: rgba(0,0,0,0.35);
font-size: 8.5pt;
font-weight: normal;
height: 25px;
ALT +F r
Ako se radi update cinnamona mora se ponovo azuritati cinnamon.css