Learn how to create image overlay hover effects.
Read on how to do it in this link: https://www.w3schools.com/howto/howto_css_image_overlay.asp
Image Overlay Fade
Learn how to create a fading overlay effect to an image, on hover:
Try it yourself here: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_image_overlay_fade