css alpha( code example

Example 1: css how to make background transparent

/* Use RGBA */
background-color: rgba(255, 255, 0, 0.75); /* Transparent Yellow */

Example 2: change transparancy img css

img {
  opacity: 0.5;
}

Example 3: css opacity

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