In our site we would like that when the mouse passes over an image, a text is displayed while changing the color of the image as a "transparent white". So that you can understand my request I suggest you if you do not mind to go to the site https://www.ajeance.fr in the menu "PROJECTS". You will see that when you move the mouse over the back image it does not completely disappear but has become a little "white" and a text is displayed, if you know what I mean.
Can you please tell me the code in HTML and/or CSS that I have to apply to have the same kind of result please? I have tried many codes but without success.