css div 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: css opacity

.div{
  opacity: 0.8; /* 1 means fully visible, 0 means invisible */
}