set image opacity css code example

Example 1: css opacity example

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

Example 2: background color with opacity

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

Example 3: image opacity in html

img {
  opacity: 0.5;
}