rrggbbaa table

background: rgba(0,0,0,.2); // rgba()
background: #00000033;      // #rrggbbaa
background: #0003;          // #rgba

Alpha	Hex	Num	Alpha	Hex	Num
100%	FF	255	50%	80	128
99%	FC	252	49%	7D	125
98%	FA	250	48%	7A	122
97%	F7	247	47%	78	120
96%	F5	245	46%	75	117
95%	F2	242	45%	73	115
94%	F0	240	44%	70	112
93%	ED	237	43%	6E	110
92%	EB	235	42%	6B	107
91%	E8	232	41%	69	105
90%	E6	230	40%	66	102
89%	E3	227	39%	63	99
88%	E0	224	38%	61	97
87%	DE	222	37%	5E	94
86%	DB	219	36%	5C	92
85%	D9	217	35%	59	89
84%	D6	214	34%	57	87
83%	D4	212	33%	54	84
82%	D1	209	32%	52	82
81%	CF	207	31%	4F	79
80%	CC	204	30%	4D	77
79%	C9	201	29%	4A	74
78%	C7	199	28%	47	71
77%	C4	196	27%	45	69
76%	C2	194	26%	42	66
75%	BF	191	25%	40	64
74%	BD	189	24%	3D	61
73%	BA	186	23%	3B	59
72%	B8	184	22%	38	56
71%	B5	181	21%	36	54
70%	B3	179	20%	33	51
69%	B0	176	19%	30	48
68%	AD	173	18%	2E	46
67%	AB	171	17%	2B	43
66%	A8	168	16%	29	41
65%	A6	166	15%	26	38
64%	A3	163	14%	24	36
63%	A1	161	13%	21	33
62%	9E	158	12%	1F	31
61%	9C	156	11%	1C	28
60%	99	153	10%	1A	26
59%	96	150	9%	17	23
58%	94	148	8%	14	20
57%	91	145	7%	12	18
56%	8F	143	6%	0F	15
55%	8C	140	5%	0D	13
54%	8A	138	4%	0A	10
53%	87	135	3%	08	8
52%	85	133	2%	05	5
51%	82	130	1%	03	3
50%	80	128	0%	00	0