To create a transparent image, use the CSS -moz-opacity property. You can try to run the following code to style an image and set opacity with CSS:
Example
<html> <head> </head> <body> <img style = "moz-opacity:0.2;filter:alpha(opacity=50);" src = "https://www.tutorialspoint.com/assets/videotutorials/courses/css_online_training/380_course_215_image.jpg" /> </body> </html>