Css opacity background color

background: rgba(255, 255, 255, 0.25);

Background color with opacity

h1 {background-color:rgba(255,0,0,0.3);}

Background opacity css hex

background-color: #ff000088; <--- the 88 is the alpha
background-color: #ff0000 50%;

Source: stackoverflow.com

Background color transparent opacity css

/* css semi-transparent background color */
.bg-semi-transparent {
  background-color: #ffffff40!important;
  /* change numbers from 00 to 99 at last of hex code 
  for transpency you want. */
}

Background color opacity

rgba(51, 170, 51, .1)    /*  10% opaque green */ 
rgba(51, 170, 51, .4)    /*  40% opaque green */ 
rgba(51, 170, 51, .7)    /*  70% opaque green */ 
rgba(51, 170, 51,  1)    /* full opaque green */

Source: stackoverflow.com

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