css color transparency code example

Example 1: css opacity background color

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

Example 2: css opacity example

.opacity30 {
  opacity: 0.3;
  filter: alpha(opacity=30); /* For IE8 and earlier */
}

Example 3: background color cs rgba

#p1 {background-color:rgba(255,0,0,0.3);}