Answers for "how to make a background image transparent"

css how to make background transparent

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

png image background transparent css

body { 
  background-color: transparent;
}

Background image opacity CSS

div {
    opacity : 50%;
}

/* Use opacity to change the opacity of selected css */