- op-0 : For opacity: 0
- op-001 : For opacity: 0.01
- op-002 : For opacity: 0.02
- op-003 : For opacity: 0.03
- op-004 : For opacity: 0.04
- op-005 : For opacity: 0.05
- op-006 : For opacity: 0.06
- op-007 : For opacity: 0.07
- op-008 : For opacity: 0.08
- op-009 : For opacity: 0.09
- op-01 : For opacity: 0.1
- op-02 : For opacity: 0.2
- op-03 : For opacity: 0.3
- op-04 : For opacity: 0.4
- op-05 : For opacity: 0.5
- op-06 :For opacity: 0.6
- op-07 : For opacity: 0.7
- op-08 : For opacity: 0.8
- op-09 : For opacity: 0.9
