color

bgc:red

background-color: red;

bgc:u

background-color: unset;

bgc

background-color:#fff;

c:#d4d4d4

color: #d4d4d4;

c:ra

color:rgb(0, 0, 0, 0.5);

c:red

color: red;

c:r

color:rgb(0, 0, 0);

c

color:#000;

op:0.5

opacity: 0.5;

op:0

opacity: 0;

op

opacity:|;

References